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  <xsd:element id="arnc_DeferredTaxAssetIncreaseDecreaseAmountForeignTaxCredit" name="DeferredTaxAssetIncreaseDecreaseAmountForeignTaxCredit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="arnc_DeferredTaxAssetsDepreciation" name="DeferredTaxAssetsDepreciation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="arnc_DeferredTaxAssetsTaxCreditCarryforwardsForeignExpiredDuringPeriod" name="DeferredTaxAssetsTaxCreditCarryforwardsForeignExpiredDuringPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="arnc_DeferredTaxAssetsValuationAcquisitionsDivestitures" name="DeferredTaxAssetsValuationAcquisitionsDivestitures" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_DeferredTaxAssetsValuationAllowanceForeignTaxCredit" name="DeferredTaxAssetsValuationAllowanceForeignTaxCredit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="arnc_DeferredTaxAssetsValuationForeignCurrencyTranslation" name="DeferredTaxAssetsValuationForeignCurrencyTranslation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_DeferredTaxAssetsValuationReleaseOfAllowance" name="DeferredTaxAssetsValuationReleaseOfAllowance" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_DeferredTaxLiabilitiesDepreciation" name="DeferredTaxLiabilitiesDepreciation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="arnc_DeferredTaxLiabilitiesEmployeeBenefits" name="DeferredTaxLiabilitiesEmployeeBenefits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="arnc_DeferredTaxLiabilitiesGross" name="DeferredTaxLiabilitiesGross" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="arnc_DeferredTaxLiabilitiesLossProvisions" name="DeferredTaxLiabilitiesLossProvisions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="arnc_DeferredTaxLiabilitiesTaxCreditCarryforwards" name="DeferredTaxLiabilitiesTaxCreditCarryforwards" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="arnc_DeferredTaxLiabilitiesTaxLossCarryforwards" name="DeferredTaxLiabilitiesTaxLossCarryforwards" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="arnc_DeferredTaxLiabilitiesValuationAllowance" name="DeferredTaxLiabilitiesValuationAllowance" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="arnc_DeferredTaxLiabilityInterest" name="DeferredTaxLiabilityInterest" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="arnc_DefinedBenefitPensionPlansNetPeriodicBenefitCost" name="DefinedBenefitPensionPlansNetPeriodicBenefitCost" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAsset" name="DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAsset" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="arnc_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostCashBalancePlanInterestCreditingRate" name="DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostCashBalancePlanInterestCreditingRate" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostInterestCostDiscountRate" name="DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostInterestCostDiscountRate" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostServiceCostDiscountRate" name="DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostServiceCostDiscountRate" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_DefinedBenefitPlanExpectedFutureBenefitPayments" name="DefinedBenefitPlanExpectedFutureBenefitPayments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="arnc_DefinedBenefitPlanExpectedFuturePrescriptionDrugSubsidyReceipt" name="DefinedBenefitPlanExpectedFuturePrescriptionDrugSubsidyReceipt" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="arnc_DefinedBenefitPlanFairValueAssumptionsAverageDurationRefinedYieldCurveModelParallelsPlans" name="DefinedBenefitPlanFairValueAssumptionsAverageDurationRefinedYieldCurveModelParallelsPlans" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_DefinedBenefitPlanLaborAgreementEmployeesSubjectToRetirementBenefitIncrease" name="DefinedBenefitPlanLaborAgreementEmployeesSubjectToRetirementBenefitIncrease" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_DefinedBenefitPlanNetAmountRecognizedBeforeTaxEffect" name="DefinedBenefitPlanNetAmountRecognizedBeforeTaxEffect" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="arnc_DefinedBenefitPlanNetFundedStatus" name="DefinedBenefitPlanNetFundedStatus" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="arnc_DefinedBenefitPlanPlanAssetsAmountExcludingCertainNetReceivables" name="DefinedBenefitPlanPlanAssetsAmountExcludingCertainNetReceivables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="arnc_DiscontinuedOperationCommonStockRetainedAfterDisposal" name="DiscontinuedOperationCommonStockRetainedAfterDisposal" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_DiscontinuedOperationsBusinessesExpectedToBeDisposedWithinCertainYears" name="DiscontinuedOperationsBusinessesExpectedToBeDisposedWithinCertainYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_DiscretionaryAndSystematicMacroHedgeFundsMember" name="DiscretionaryAndSystematicMacroHedgeFundsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_DisksAssetsGroupMember" name="DisksAssetsGroupMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_DisksBusinessMember" name="DisksBusinessMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_DisposalGroupIncludingDiscontinuedOperationConsiderationConsiderationAssets" name="DisposalGroupIncludingDiscontinuedOperationConsiderationConsiderationAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="arnc_DivestedBusinessesMember" name="DivestedBusinessesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_EffectiveIncomeTaxRateReconciliationDeductibleExpenseRestructuringChargesPercent" name="EffectiveIncomeTaxRateReconciliationDeductibleExpenseRestructuringChargesPercent" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_EffectiveIncomeTaxRateReconciliationDeductionForeignTaxesAmount" name="EffectiveIncomeTaxRateReconciliationDeductionForeignTaxesAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="arnc_EffectiveIncomeTaxRateReconciliationFederalBenefitOfStateTaxesPercent" name="EffectiveIncomeTaxRateReconciliationFederalBenefitOfStateTaxesPercent" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCostPercent" name="EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCostPercent" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_EffectiveIncomeTaxRateReconciliationNondeductibleOfficerCompensationPercent" name="EffectiveIncomeTaxRateReconciliationNondeductibleOfficerCompensationPercent" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_EffectiveIncomeTaxReconciliationUnitedStatesAndResidualTaxOnForeignEarningsPercent" name="EffectiveIncomeTaxReconciliationUnitedStatesAndResidualTaxOnForeignEarningsPercent" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_EgerMember" name="EgerMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ElectricityContractMember" name="ElectricityContractMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_EliminationOfLifeInsuranceBenefitsMember" name="EliminationOfLifeInsuranceBenefitsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_EmployeeSeveranceCostEffectsOfForeignCurrencyTranslationAndOtherMember" name="EmployeeSeveranceCostEffectsOfForeignCurrencyTranslationAndOtherMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_EmployeeSeveranceCostReclassificationOfPensionCostsMember" name="EmployeeSeveranceCostReclassificationOfPensionCostsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_EmployeeSeveranceCostsCreditInPostRetirementCostsMember" name="EmployeeSeveranceCostsCreditInPostRetirementCostsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_EmployeeSeveranceCostsStockAwardReversalsMember" name="EmployeeSeveranceCostsStockAwardReversalsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_EmployeeSeveranceReversalOfPriorRestructuringMember" name="EmployeeSeveranceReversalOfPriorRestructuringMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_EngineeredProductsAndForgingsMember" name="EngineeredProductsAndForgingsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_EngineeredProductsAndSolutionsMember" name="EngineeredProductsAndSolutionsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_EnvironmentalMattersPolicyTextBlock" name="EnvironmentalMattersPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_EquitiesEquitySecuritiesMember" name="EquitiesEquitySecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_EstimatedPercentageOfCompensationExpenseInPerformanceBasedAwardPayouts" name="EstimatedPercentageOfCompensationExpenseInPerformanceBasedAwardPayouts" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ExecutiveSeveranceNetOfTheBenefitOfForfeitedExecutiveStockCompensationMember" name="ExecutiveSeveranceNetOfTheBenefitOfForfeitedExecutiveStockCompensationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ExpiresWithinElevenToTwentyYearsMember" name="ExpiresWithinElevenToTwentyYearsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ExpiresWithinTenYearsMember" name="ExpiresWithinTenYearsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ExtendedAdditionalMaturityPeriod" name="ExtendedAdditionalMaturityPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_February2019ASRMember" name="February2019ASRMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_FirthRixsonMember" name="FirthRixsonMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_FivePointEightSevenPercentNotesDueTwoThousandTwentyTwoMember" name="FivePointEightSevenPercentNotesDueTwoThousandTwentyTwoMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_FivePointFourZeroPercentNotesDueTwoThousandTwentyOneMember" name="FivePointFourZeroPercentNotesDueTwoThousandTwentyOneMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_FivePointNineFivePercentNotesDueTwoThousandThirtySevenMember" name="FivePointNineFivePercentNotesDueTwoThousandThirtySevenMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_FivePointNinePercentNotesDueTwoThousandTwentySevenMember" name="FivePointNinePercentNotesDueTwoThousandTwentySevenMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_FivePointOneTwoFivePercentNotesDueTwoThousandTwentyFourMember" name="FivePointOneTwoFivePercentNotesDueTwoThousandTwentyFourMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_FivePointSevenTwoPercentNotesDueTwoThousandNineteenMember" name="FivePointSevenTwoPercentNotesDueTwoThousandNineteenMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_FixedIncomeOtherMember" name="FixedIncomeOtherMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_FlatRolledAluminumMember" name="FlatRolledAluminumMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ForgingsBusinessMember" name="ForgingsBusinessMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_FundingOfCustomerReceivablesSold" name="FundingOfCustomerReceivablesSold" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_FusinaItalyMember" name="FusinaItalyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_GainLossOnDispositionOfAssetsNetOfTax" name="GainLossOnDispositionOfAssetsNetOfTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_GlobalRolledProductsMember" name="GlobalRolledProductsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_GoodwillAcquisitionAndDivestitures" name="GoodwillAcquisitionAndDivestitures" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_GrossAmountofReceivablesSoldSinceInception" name="GrossAmountofReceivablesSoldSinceInception" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_GrossPostretirementDefinedBenefitPlanMember" name="GrossPostretirementDefinedBenefitPlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_GuaranteePaymentsToThirdParty" name="GuaranteePaymentsToThirdParty" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ImpairmentForTradeNameIntangibleAssetAndFixedAssetsMember" name="ImpairmentForTradeNameIntangibleAssetAndFixedAssetsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ImpairmentOfACostMethodInvestmentMember" name="ImpairmentOfACostMethodInvestmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ImpairmentOfDisksMember" name="ImpairmentOfDisksMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_IncomeTaxExaminationAssessmentOutstanding" name="IncomeTaxExaminationAssessmentOutstanding" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="arnc_IncomeTaxExpensePaymentOfInterestAndPenalties" name="IncomeTaxExpensePaymentOfInterestAndPenalties" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_IncreaseDecreaseInSharebasedCompensation" name="IncreaseDecreaseInSharebasedCompensation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_IndustrialAndOtherMember" name="IndustrialAndOtherMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_InsuranceAnnualCoverageLimit" name="InsuranceAnnualCoverageLimit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_InsurancePolicyTerm" name="InsurancePolicyTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_InterestCostComponentsDisclosureTextBlock" name="InterestCostComponentsDisclosureTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_IntermediateAndLongDurationGovernmentCreditMember" name="IntermediateAndLongDurationGovernmentCreditMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_InvestmentBanksMember" name="InvestmentBanksMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_InvestmentCastingsMember" name="InvestmentCastingsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_InvestmentInPreferredShare" name="InvestmentInPreferredShare" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="arnc_IowaAuthorityLoanMember" name="IowaAuthorityLoanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_LaborAgreementDuration" name="LaborAgreementDuration" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_LaborAgreementNumberOfEmployees" name="LaborAgreementNumberOfEmployees" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_LaborAgreementOneTimeSigningBonus" name="LaborAgreementOneTimeSigningBonus" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_LaborAgreementTerm" name="LaborAgreementTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_LatinAmericaExtrusionsLAEMember" name="LatinAmericaExtrusionsLAEMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_LeaseObligationsIncurredOperatingLease" name="LeaseObligationsIncurredOperatingLease" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="arnc_LettersOfCreditTotal" name="LettersOfCreditTotal" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="arnc_LineOfCreditFacilityTerm" name="LineOfCreditFacilityTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_LineofCreditFacilityMaximumIncreaseinBorrowingCapacity" name="LineofCreditFacilityMaximumIncreaseinBorrowingCapacity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="arnc_LitigationMattersPolicyTextBlock" name="LitigationMattersPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
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  <xsd:element abstract="true" id="arnc_MandatoryConvertiblePreferredStockMember" name="MandatoryConvertiblePreferredStockMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
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  <xsd:element abstract="true" id="arnc_May2019ASRMember" name="May2019ASRMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_MedicarePartDSubsidyReceiptsMember" name="MedicarePartDSubsidyReceiptsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_MinimumIndebtednessforOtherPrincipalAmounts" name="MinimumIndebtednessforOtherPrincipalAmounts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="arnc_MinimumPercentageOfEstimatedFairValueOfReportingUnitToBeLessThanCarryingAmountOfGoodwill" name="MinimumPercentageOfEstimatedFairValueOfReportingUnitToBeLessThanCarryingAmountOfGoodwill" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_MinimumRequiredCashContributionToPensionPlan" name="MinimumRequiredCashContributionToPensionPlan" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_MinimumRequiredTermsofLeasesonCastHouseBuildingandEquipment" name="MinimumRequiredTermsofLeasesonCastHouseBuildingandEquipment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_NetCashFundingReceivedForDevelopmentOfReservesDuringThePeriod" name="NetCashFundingReceivedForDevelopmentOfReservesDuringThePeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
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  <xsd:element abstract="true" id="arnc_NewYorkofficeMember" name="NewYorkofficeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_NickelContractsMember" name="NickelContractsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
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  <xsd:element id="arnc_NoOfYearOverActualAnnualHealthcareCostTrendExperience" name="NoOfYearOverActualAnnualHealthcareCostTrendExperience" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_NumberOfArrangementsToSellCustomerReceivables" name="NumberOfArrangementsToSellCustomerReceivables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_NumberOfCashTenderOffers" name="NumberOfCashTenderOffers" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="arnc_NumberOfCleanupLocations" name="NumberOfCleanupLocations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_NumberOfEmployees" name="NumberOfEmployees" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_NumberOfLongTermEnergySupplyAgreements" name="NumberOfLongTermEnergySupplyAgreements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="arnc_NumberOfPlants" name="NumberOfPlants" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_NumberOfRepaymentTranches" name="NumberOfRepaymentTranches" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_NumberofAgreementsTerminated" name="NumberofAgreementsTerminated" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_OnePointSixThreePercentConvertibleNotesDueTwoThousandNineteenMember" name="OnePointSixThreePercentConvertibleNotesDueTwoThousandNineteenMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_OperatingLeasesFutureMinimumPaymentsDueAfterYearSix" name="OperatingLeasesFutureMinimumPaymentsDueAfterYearSix" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="arnc_OperatingLeasesFutureMinimumPaymentsDueInSixYears" name="OperatingLeasesFutureMinimumPaymentsDueInSixYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
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  <xsd:element id="arnc_OtherComprehensiveIncomeDefinedBenefitPlanNetAmountRecognizedBeforeTaxEffect" name="OtherComprehensiveIncomeDefinedBenefitPlanNetAmountRecognizedBeforeTaxEffect" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_OtherCostsRelatedToRestructuring" name="OtherCostsRelatedToRestructuring" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_OtherDeferredTaxAssetsMember" name="OtherDeferredTaxAssetsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_OtherExitCostLeaseTerminationLossMember" name="OtherExitCostLeaseTerminationLossMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
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  <xsd:element abstract="true" id="arnc_OtherInvestmentsOtherMember" name="OtherInvestmentsOtherMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
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  <xsd:element abstract="true" id="arnc_OtherNetStateDeferredTaxAssetMember" name="OtherNetStateDeferredTaxAssetMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_OtherNonOperatingIncomeExpenseLineItems" name="OtherNonOperatingIncomeExpenseLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_OtherNoncurrentLiabilitiesAndDeferredCreditsMember" name="OtherNoncurrentLiabilitiesAndDeferredCreditsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
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  <xsd:element abstract="true" id="arnc_PatentLicenseAgreementMember" name="PatentLicenseAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
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  <xsd:element id="arnc_PaymentForPensionBenefitPlanInExcessOfMinimumRequired" name="PaymentForPensionBenefitPlanInExcessOfMinimumRequired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
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  <xsd:element id="arnc_PercentageOfDeferredTaxAssetExclusiveOfReversingTemporaryDifferences" name="PercentageOfDeferredTaxAssetExclusiveOfReversingTemporaryDifferences" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_PercentageOfEffectOfUnrecognizedTaxBenefitIfRecorded" name="PercentageOfEffectOfUnrecognizedTaxBenefitIfRecorded" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_PercentageOfGoodwillAllocatedToReportingUnits" name="PercentageOfGoodwillAllocatedToReportingUnits" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_PercentageOfTemporaryTaxDifferencesThatReverseWithinCarryforwardPeriod" name="PercentageOfTemporaryTaxDifferencesThatReverseWithinCarryforwardPeriod" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_PeriodRequiredForOneQuantitativeImpairmentTestToBePerformedForEachReportingUnit" name="PeriodRequiredForOneQuantitativeImpairmentTestToBePerformedForEachReportingUnit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_PeriodofOperationalizingRollingMillEquipmentofTransactionClosingDate" name="PeriodofOperationalizingRollingMillEquipmentofTransactionClosingDate" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_PeriodofServicesPerformedProcessingofMetal" name="PeriodofServicesPerformedProcessingofMetal" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_PeriodofSupplywithAluminum" name="PeriodofSupplywithAluminum" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_PostretirementCurtailmentBenefitMember" name="PostretirementCurtailmentBenefitMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_PreferredStockConversionPrice" name="PreferredStockConversionPrice" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="instant" />
  <xsd:element id="arnc_PreferredStockConversionRatePerShare" name="PreferredStockConversionRatePerShare" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="instant" />
  <xsd:element id="arnc_PreferredStockNumberOfClasses" name="PreferredStockNumberOfClasses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_PriorToAmendmentMember" name="PriorToAmendmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ProceedsFromIssuancePublicOfferingNetOfOfferingCosts" name="ProceedsFromIssuancePublicOfferingNetOfOfferingCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_ProceedsFromReceivableFundingDuringThePeriod" name="ProceedsFromReceivableFundingDuringThePeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_ProceedsFromReceivableFundingSinceInception" name="ProceedsFromReceivableFundingSinceInception" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_PropertiesPlantsAndEquipmentExcludingConstructionWorkInProgress" name="PropertiesPlantsAndEquipmentExcludingConstructionWorkInProgress" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="arnc_PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" name="PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="arnc_ProposedSeparationTransactionMember" name="ProposedSeparationTransactionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ReceivablesExcludedFromPensionPlanAssets" name="ReceivablesExcludedFromPensionPlanAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="arnc_ReceivablesFromCustomersMember" name="ReceivablesFromCustomersMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_RecurringCostsOfManagingHazardousSubstancesAndEnvironmentalProgramsMember" name="RecurringCostsOfManagingHazardousSubstancesAndEnvironmentalProgramsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_RepaymentsForReceivableFundingDuringThePeriod" name="RepaymentsForReceivableFundingDuringThePeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="arnc_RepaymentsForReceivableFundingSinceInception" name="RepaymentsForReceivableFundingSinceInception" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_RestructuringAcceleratedDepreciationMember" name="RestructuringAcceleratedDepreciationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_RestructuringAndOtherCharges" name="RestructuringAndOtherCharges" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_RestructuringAndOtherChargesAfterTax" name="RestructuringAndOtherChargesAfterTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_RestructuringAndOtherChargesAfterTaxAndNoncontrollingInterests" name="RestructuringAndOtherChargesAfterTaxAndNoncontrollingInterests" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_RestructuringAndOtherChargesMember" name="RestructuringAndOtherChargesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_RestructuringProgramsLayoffsMember" name="RestructuringProgramsLayoffsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_RestructuringProgramsLayoffsTwoThousandEighteenMember" name="RestructuringProgramsLayoffsTwoThousandEighteenMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_RestructuringProgramsLayoffsTwoThousandNineteenMember" name="RestructuringProgramsLayoffsTwoThousandNineteenMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_RestructuringProgramsLayoffsTwoThousandSeventeenMember" name="RestructuringProgramsLayoffsTwoThousandSeventeenMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_RestructuringReservePeriodExpenses" name="RestructuringReservePeriodExpenses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_RevenueTermsOfPaymentPeriod" name="RevenueTermsOfPaymentPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ReversalOfForfeitedExecutiveStockCompensation" name="ReversalOfForfeitedExecutiveStockCompensation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ReversalOfForfeitedExecutiveStockCompensationMember" name="ReversalOfForfeitedExecutiveStockCompensationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ReversalsOfPreviouslyRecordedLayoff" name="ReversalsOfPreviouslyRecordedLayoff" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_RevolvingCreditAgreementMember" name="RevolvingCreditAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_SaleOfCompanysBrazilianRollingMillOperationsMember" name="SaleOfCompanysBrazilianRollingMillOperationsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_SaleOfCustomerReceivables" name="SaleOfCustomerReceivables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_SalesPercentage" name="SalesPercentage" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ScheduleOfAssetsBySegmentLineItems" name="ScheduleOfAssetsBySegmentLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ScheduleOfAssetsBySegmentTable" name="ScheduleOfAssetsBySegmentTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ScheduleOfCarryingValuesAndFairValuesOfOtherFinancialInstrumentsTableTextBlock" name="ScheduleOfCarryingValuesAndFairValuesOfOtherFinancialInstrumentsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ScheduleOfCommonStockLineItems" name="ScheduleOfCommonStockLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ScheduleOfCommonStockTable" name="ScheduleOfCommonStockTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ScheduleOfComponentsOfNetPeriodicBenefitCostTextBlock" name="ScheduleOfComponentsOfNetPeriodicBenefitCostTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ScheduleOfExpirationPeriodsOfDeferredTaxAssetsTableTextBlock" name="ScheduleOfExpirationPeriodsOfDeferredTaxAssetsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ScheduleOfFinancialReceivablesLineItems" name="ScheduleOfFinancialReceivablesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ScheduleOfFinancialReceivablesTable" name="ScheduleOfFinancialReceivablesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ScheduleOfInterestCostComponentsTableTextBlock" name="ScheduleOfInterestCostComponentsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ScheduleOfOtherNonOperatingIncomeExpenseTable" name="ScheduleOfOtherNonOperatingIncomeExpenseTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ScheduleOfProFormaRestructuringChargesByReportableSegmentBeforeIncomeTaxTableTextBlock" name="ScheduleOfProFormaRestructuringChargesByReportableSegmentBeforeIncomeTaxTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ScheduleOfSegmentReportingInformationToConsolidateNetIncomeLossAttributableToParentTextBlock" name="ScheduleOfSegmentReportingInformationToConsolidateNetIncomeLossAttributableToParentTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ScheduleOfSharesActivityTableTextBlock" name="ScheduleOfSharesActivityTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ScheduleOfStockOptionActivityLineItems" name="ScheduleOfStockOptionActivityLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ScheduleOfStockOptionActivityTable" name="ScheduleOfStockOptionActivityTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ScheduleOfWeightedAverageUsefulLivesOfStructuresAndMachineryAndEquipmentTextBlock" name="ScheduleOfWeightedAverageUsefulLivesOfStructuresAndMachineryAndEquipmentTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_SecondLienNotesDue2028Member" name="SecondLienNotesDue2028Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_SegmentReportingInformationCapitalExpenditures" name="SegmentReportingInformationCapitalExpenditures" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_SegmentReportingInformationCorporateExpenses" name="SegmentReportingInformationCorporateExpenses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_SegmentReportingInformationDepreciationAndAmortizationExpense" name="SegmentReportingInformationDepreciationAndAmortizationExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_SegmentReportingInformationProfitsLosses" name="SegmentReportingInformationProfitsLosses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="arnc_SegmentReportingInformationRestructuringAndOtherCharges" name="SegmentReportingInformationRestructuringAndOtherCharges" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_SeniorUnsecuredRevolvingCreditFacilityMember" name="SeniorUnsecuredRevolvingCreditFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_SeparationAgreementMember" name="SeparationAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_SeparationAndDistributionAgreementSuretyBondsAmountOutstanding" name="SeparationAndDistributionAgreementSuretyBondsAmountOutstanding" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="arnc_SeparationTransactionCostsBeforeTax" name="SeparationTransactionCostsBeforeTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_SeparationTransactionCostsNetOfTax" name="SeparationTransactionCostsNetOfTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_SeparationTransactionNumberOfIndependentPubliclyTradedCompaniesFormed" name="SeparationTransactionNumberOfIndependentPubliclyTradedCompaniesFormed" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedInPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageGrantDateFairValue" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceAdjustmentWeightedAverageGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceAdjustmentWeightedAverageGrantDateFairValue" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceShareAdjustment" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceShareAdjustment" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceSharesActualPayout" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceSharesActualPayout" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAnnualForfeitureRate" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAnnualForfeitureRate" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExerciseBehavior" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExerciseBehavior" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsConverted" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsConverted" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentOfCost" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentOfCost" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsConvertedOrTransferredInPeriodWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsConvertedOrTransferredInPeriodWeightedAverageExercisePrice" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ShareRepurchasesProgramNovember2019Member" name="ShareRepurchasesProgramNovember2019Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_SharesThatWouldHaveBeenIncludedInDilutedEarningsPerShareCalculation" name="SharesThatWouldHaveBeenIncludedInDilutedEarningsPerShareCalculation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_ShortTermDebtExcludingCurrentMaturitiesOfLongtermDebt" name="ShortTermDebtExcludingCurrentMaturitiesOfLongtermDebt" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="arnc_SixPointFivePercentBondsDueTwoThousandEighteenMember" name="SixPointFivePercentBondsDueTwoThousandEighteenMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_SixPointOneFivePercentNotesDueTwoThousandTwentyMember" name="SixPointOneFivePercentNotesDueTwoThousandTwentyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_SixPointSevenFivePercentBondsDueTwoThousandTwentyEightMember" name="SixPointSevenFivePercentBondsDueTwoThousandTwentyEightMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_SixPointSevenFivePercentNotesDueTwoThousandEighteenMember" name="SixPointSevenFivePercentNotesDueTwoThousandEighteenMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_SlimAluminiumMember" name="SlimAluminiumMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_SmallAdditiveBusinessMember" name="SmallAdditiveBusinessMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_SmallAdditiveManufacturingFacilityMember" name="SmallAdditiveManufacturingFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_StockAwardsMember" name="StockAwardsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_SummaryOfSignificantAccountingPoliciesLineItems" name="SummaryOfSignificantAccountingPoliciesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_SummaryOfSignificantAccountingPoliciesTable" name="SummaryOfSignificantAccountingPoliciesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_TaChenInternationalInc.Member" name="TaChenInternationalInc.Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_TaxAgreementIndemnificationofUltimateLiabilityPercent" name="TaxAgreementIndemnificationofUltimateLiabilityPercent" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="arnc_TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateOneTimeTransitionTax" name="TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateOneTimeTransitionTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="arnc_TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateValuationAllowance" name="TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateValuationAllowance" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_TexarkanaTexasRollingMillAndCastHouseMember" name="TexarkanaTexasRollingMillAndCastHouseMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_TexarkanaTexasRollingMillMember" name="TexarkanaTexasRollingMillMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_ThirdPartySalesMember" name="ThirdPartySalesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_TrancheDueDecember2015Member" name="TrancheDueDecember2015Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_TrancheDueOctober2019Member" name="TrancheDueOctober2019Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_TransportationAndConstructionSolutionsMember" name="TransportationAndConstructionSolutionsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_TransportationMember" name="TransportationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_UKForgingsMember" name="UKForgingsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_UnrecognizedTaxBenefitsForeignCurrencyTranslation" name="UnrecognizedTaxBenefitsForeignCurrencyTranslation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="arnc_VariousOtherExitCostsMember" name="VariousOtherExitCostsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_WeightedAverageExercisePriceOfUnderwaterOptions" name="WeightedAverageExercisePriceOfUnderwaterOptions" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_WeightedAverageInterestRateOutstandingBorrowings" name="WeightedAverageInterestRateOutstandingBorrowings" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="arnc_WeightedAverageUsefulLivesOfSoftwareAndOtherIntangibleAssetsByReportingSegmentTextBlock" name="WeightedAverageUsefulLivesOfSoftwareAndOtherIntangibleAssetsByReportingSegmentTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
</xsd:schema>
