Acta Materialia 61 (2013) 2102–2112[1]

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1、Availableonlineatwww.sciencedirect.comActaMaterialia61(2013)2102–2112www.elsevier.com/locate/actamatAbridgefrommonotecticalloystoliquid-phase-separatedbulkmetallicglasses:Design,microstructureandphaseevolutiona,b,⇑aabaacJ.He,N.Mattern,J.Tan,J.Z.Zhao,I.Kaban,Z.Wang,L.Ratk

2、e,dea,fD.H.Kim,W.T.Kim,J.EckertaIFWDresden,InstituteforComplexMaterials,POBox270116,D-01171Dresden,GermanybInstituteofMetalResearch,ChineseAcademyofSciences,110016Shenyang,People’sRepublicofChinacGermanAerospaceCenter,InstituteofMaterialsPhysicsinSpace,D-51147Ko¨ln,Germa

3、nydCenterforNon-CrystallineMaterials,DepartmentofMaterialsScienceandEngineering,YonseiUniversity,134Shinchon-dong,Seodaemun-ku,Seoul120-749,RepublicofKoreaeDepartmentofOpticalEngineering,CheongjuUniversity,36Naedock-dong,Cheongju360-764,RepublicofKoreafTUDresden,Institut

4、eofMaterialsScience,D-01062Dresden,GermanyReceived18October2012;receivedinrevisedform12December2012;accepted23December2012Availableonline29January2013AbstractTheZr–Ce–Lasystemischaracterizedbyamiscibilitygapandamonotecticreaction.ItseparatesintoZr-richandCeLa-richliquids

5、uponcoolingthroughthegap.Basedonthissystem,anewZr–Ce–La–Al–Comonotecticsystemwascreatedtosynthesizeliquid-phase-separatedbulkmetallicglasses(LPS-BMGs)bycoppermoldcasting.AsystematicalinvestigationwasperformedfortheeffectsoftherelativeatomicratiosofZr:CeLa,Co:AlandCe:Laont

6、hemicrostructurefeaturesandchemicalcompositionsofthetwocoexistent11phases.Dualatompairswithpositiveheatofmixing(Zr–Ce:+12kJmolandZr–La:+13kJmol)areoriginallyadoptedtodevelopsuchLPS-BMGs.AseriesofinsituformedLPS-BMGswithacriticalthicknessof2.5mmhasbeensuccessfullysynthe

7、sized.Bycom-biningthekineticsofliquid–liquidphaseseparationwiththeformationofmetallicglasses,themechanismsofphaseformationandthemicrostructureevolutionintherapidlycooledalloysarediscussedindetail.Furthermore,athermodynamicmodelisproposedforLPS-BMGdesign,attemptingtobuild

8、abridgefrommonotectic/immiscible(M/I)alloystoLPS-BMGs.Thisworknotonlyprovidesoppor-tunitiesfornewinsigh