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1、MaterialsLetters60(2006)1758–1761www.elsevier.com/locate/matletReactivediffusionintherollbondediron–aluminumsystemVikasJindal⁎,V.C.Srivastava,ArpanDas,R.N.GhoshNationalMetallurgicalLaboratory,Jamshedpur831007,IndiaReceived9November2005;accepted4December2005Availableonline29December2005Abs
2、tractThediffusion-controlledgrowthofironaluminide(Fe2Al5)wasstudiedonbulkFe–Alsolidstatediffusioncouplesannealedfor10–90minat773–873K.Thelayergrowthkineticswasparabolic.TheparabolicgrowthconstantsofthesecondkindfortheexclusivegrowthofFe2Al5fromtheadjacentphaseswerecalculatedfromthemeasure
3、mentontheFe–Aldiffusioncouples.Therateconstantsofthesecondkindwereinturnrelatedtothediffusionpropertiesofthealuminide.Asaresult,theinterdiffusioncoefficient,takingintoaccountthediffusionofbothelements,−1wasobtainedforFe2Al5phase.Theresultingactivationenergywas84.9kJmol.©2005ElsevierB.V.Al
4、lrightsreserved.Keywords:Kinetics;Diffusion;Heattreatment;Intermetallicalloysandcompounds1.Introductionstudyisanattempttostudyironandaluminuminterdiffusionkineticsthroughintermetalliclayer.Ingeneral,elementalme-Intermetalliccompoundsareofconsiderableinterestbe-tallicstackforannealingtreat
5、mentispreparedbyhotpress-causeoftheirhightemperaturestrength,lowdensityanding.But,inthepresentstudythisisaccomplishedbywarmhighcreepresistance.However,applicationofintermetallicsrollingand,therefore,employinghighlystrainedmaterialstohasbeenlimitedduetotheirhighlybrittlebehavioratambi-star
6、twith.enttemperature[1].Whereas,ifintermetallicsarecomple-mentedwithductilemetallicphase,togethertheyoffera2.Experimentaldetailsgoodcombinationofstrengthandtoughness.Basedonthisidea,anewclassofstructuralmaterialknownasmetal–Inthepresentstudy,cold-rolledandfullyannealedIF-steelintermetalli
7、claminate(MIL)compositeswasdevelopedbysheets(1×30×90mm)andcommerciallyavailablealuminumHarachandVeccchio[2].MILcomposites,basedonthefoils(120μmthick)ofmatchingdimensionsweretaken.AlcombinationsuchasTi–Al3TiandNi–Al3Ni,havebeenfoilsweresandwichedbetweentwoIF-steelshe
