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  <element id="aa_DiscreteIncomeTaxChargeForChangeInAnticipatedStructureOfPotentialSale" name="DiscreteIncomeTaxChargeForChangeInAnticipatedStructureOfPotentialSale" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="aa_ConvertibleNotesMember" name="ConvertibleNotesMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aa_StockAndPerformanceAwardsMember" name="StockAndPerformanceAwardsMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aa_OutstandingStockAwardMember" name="OutstandingStockAwardMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aa_OtherExpensesIncomeNetMember" name="OtherExpensesIncomeNetMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aa_DampierToBunbryNaturalGasPipelineDbngpMember" name="DampierToBunbryNaturalGasPipelineDbngpMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aa_EstreitoProjectMember" name="EstreitoProjectMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aa_ScheduleOfCommitmentsAndContingenciesTable" name="ScheduleOfCommitmentsAndContingenciesTable" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" xbrli:periodType="duration" />
  <element id="aa_ScheduleOfPensionAndOtherPostretirementBenefitsTable" name="ScheduleOfPensionAndOtherPostretirementBenefitsTable" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" xbrli:periodType="duration" />
  <element id="aa_AmountContributedTowardCommitment" name="AmountContributedTowardCommitment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="aa_MarginsHeldMember" name="MarginsHeldMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aa_ForiegnCurrencyMovementsMember" name="ForiegnCurrencyMovementsMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aa_OnGoingActivityFromPriorPeriodsActionsMember" name="OnGoingActivityFromPriorPeriodsActionsMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aa_PunitiveDamagesMember" name="PunitiveDamagesMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aa_NegligenceClaimForPropertyDamagesMember" name="NegligenceClaimForPropertyDamagesMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aa_CapitalInvestmentCommitmentPaidInPeriod" name="CapitalInvestmentCommitmentPaidInPeriod" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="aa_CashAvailableForPurchaseOfDebt" name="CashAvailableForPurchaseOfDebt" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="aa_ConsiderationToBePaidForPurchasePerBaseOfNote" name="ConsiderationToBePaidForPurchasePerBaseOfNote" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
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  <element id="aa_PremiumToBePaidForPurchasePerBaseOfNote" name="PremiumToBePaidForPurchasePerBaseOfNote" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="aa_FivePointFourPercentDueTwoThousandTwentyOneMember" name="FivePointFourPercentDueTwoThousandTwentyOneMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aa_IncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted" name="IncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
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</schema>
