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1、MaterialsScienceandEngineeringA315(2001)8997www.elsevier.com/locate/mseaAmorphousandnanostructuredAlFeNdpowdersobtainedbygasatomizationK.R.Cardosoa,b,c,A.Garcı´aEscoriala,*,M.Lieblicha,W.J.BottaF.baCENIM-CSIC,A.GregoriodelAmo,8.28040,Madrid,SpainbDEMa-UFSCar,Sa˜oCarlos-SP,BrazilcUNIVA
2、P,A.ShishimaHifumi,2911,12244-000.Sa˜oJosedosCampos-SP,BrazilReceived5June2000;receivedinrevisedform24January2001AbstractInthiswork,anAl90Fe5Nd5alloywasatomizedanditsmicrostructure,thermalstability,transformationsequenceandmicrohardnessinvestigatedasafunctionofpowderparticlesize.Theat
3、omizedpowdercontainedonaveragea25%volumefractionofamorphousmaterials,reaching42%inthe25msizerange.Withthermaltreatmentsthematerialevolvedthroughthreeexothermicreactions,whichinvolvedtheformationofananostructuredstateFe-andNd-enrichedamorphousmatrix+fcc-Alnanocrystalsat240°C,theformat
4、ionofametastableternaryphaseat360°Cand,finally,theformationoftheequilibriumAl10Fe2NdandAl11Nd3phases.Thehighthermalstabilityoftheamorphous+fcc-Alnanostructuredstate,120°C,andthehighhardness,280Hv,ofthisalloymakeitagoodcandidateforconsolidatebulkmaterialfortechnologicalapplications.©2001
5、ElsevierScienceB.V.Allrightsreserved.Keywords:Amorphous;Nanostructure;Aluminium;Atomization1.Introductiontheinterestisfocusedonthedevelopmentofthesehighglass-forming-abilityAlalloysinabulkformthatThefindingin1988[1]ofaluminiumbasedamor-couldbeobtainedbymassproductiontechniquessuchphousa
6、lloyswithanAlcontentabove80at.%,whichasinertgasatomisationfollowedbyaconventionalexhibitedtensilestrengthsofover800MPaaswellasconsolidationprocesssuchashotextrusion.Onthegoodductility,generatedgreatinterestinthedevelop-otherhand,fromascientificpointofview,theinterestmentofothersimilarsy
7、stems.Sincethen,Alamor-intheseAl-basealloysistoreachabetterunderstand-phousalloyshavebeenproducedbyrapidsolidificationingoftheirglassformingabilityaswellasthemecha-intheAlRE,AlETMLTMandAlRETMsys-nismsandkineticswhichcontrolthemicrostructuretems(RE=RareEarth,ETMandLTM=Earlyanddevelopme
