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1、MaterialsScienceandEngineeringA459(2007)375382GrowthbehaviorofFe2Al5duringreactivediffusionbetweenFeandAlatsolid-statetemperaturesD.Naoia,M.Kajiharab,∗aGraduateSchool,TokyoInstituteofTechnology,Midori-ku,Yokohama226-8502,JapanbDepartmentofMaterialsScienceandEngineering,TokyoInstituteofTechnology,M
2、idori-ku,Yokohama226-8502,JapanReceived22October2006;receivedinrevisedform27December2006;accepted26January2007AbstractThesolid-statereactivediffusionbetweenFeandAlwasexperimentallyobservedusingAl/Fe/Aldiffusioncouplespreparedbyadiffusionbondingtechnique.Thediffusioncoupleswereisothermallyannealedi
3、nthetemperaturerangebetweenT=823and913Kforvarioustimesupto120h.Duetoannealing,Fe2Al5isproducedasalayerattheFe/Alinterfaceinthediffusioncouple.AlthoughFeAl,FeAl2andFeAl3arealsostableintermetalliccompoundsinthistemperaturerange,thesecompoundswerenotrecognizedinthediffusioncouplewithintheexperimental
4、annealingtimes.ThemeanthicknessoftheFe2Al5layerisproportionaltothesquarerootoftheannealingtime,andgraingrowthoccursintheFe2Al5layer.ThismeansthatthegrowthoftheFe2Al5layeriscontrolledbythevolumediffusionoftheconstituentelementsineachphase.Onthebasisoftheobservationforthegrowthrate,wemayestimatethat
5、theinterdiffusioncoefficientisaboutoneorderofmagnitudesmallerforFe2Al5thanforAlbutmorethanthreeordersofmagnitudegreaterforFe2Al5thanforFe.Ifnucleationoccurssufficientlyfastforallthecompounds,theinterdiffusioncoefficientshouldbemorethantwoordersofmagnitudesmallerforFeAl,FeAl2andFeAl3thanforFe2Al5.©200
6、7ElsevierB.V.Allrightsreserved.Keywords:Ironaluminides;Diffusionbonding;Interfacemigration;Reactivediffusion;EPMA1.Introductionthediffusioncoupleevenafterlongannealing.SuchcaseshavebeenactuallyreportedbymanyinvestigatorsformanifoldalloyIntermetalliccompoundsappearasstablephasesinmanysystems[125].b
7、inaryalloysystems.TheequilibriumphasediagraminsuchaForinstance,thereactivediffusioninthebinaryAuSnbinarysystemmaybeexperimentallydeterminedbyareactivesystemwasexperimentallyobservedatsolid-statetempera-diffusiont
