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1、高熵合金pptTraditionalalloysaremostlybasedononeprimaryelementSteels(Fe),Alalloys,Tialloys,Mgalloys,Supperalloys(Ni)DiscoveryofhighentropyalloysCantorBetal.MSEA,2004,375-377:213-218.In2004,MulticomponentFeCoNiCrMnalloyfirstlyreportedbyCantorB.withasimplefccsolid-solutionstructure.Yeh
2、JWetal.AdvEngMater,2004,6:299-303.DefinitionofhighentropyalloysStillin2004,theconceptofhighentropyalloywasfirstlyintroducedbyYehJWSimplephaseformationbutcomplexmetallurgicalphenomenonCu-ZrbinaryalloysystemActuallyHEAsalloyhaveasimplesolid-solutionstructure(mainlyfccorbcc)!!TheGi
3、bbsPhaseRuleP=N+1-FWhenN=5,P=6FeCoNiCrMnFeaturesofHEAs——severelatticedistortionLatticedistortionZhou,etal.ApplPhysLett,2008,92:241917SenkovON,etal.Intermetallics,2011,19:698SolutionstrengtheningeffectTsaietal.ActaMater2013;61:4887ConstituentelementsintheHEAmatrixdiffusemuchslowl
4、yovertheentiretemperaturerangeThediffusioncoefficientofNiisthesmallestamongthatofallconstituentsFeaturesofHEAs——sluggishdiffusionSenkovetal.Intermetallics2011;19:698-706As-castAftercompressionat1073KFormationofasinglebccphaseThebccphaseishighlystableupto1600oC1400oC19hFeaturesof
5、HEAs——highphasestabilityFeaturesofHEAs——cocktaileffecttheeffectindicatesthattheunexpectedpropertiescanbeobtainedaftermixingmanyelements,whichcouldnotbeobtainedfromanyoneindependentelement.ExtremelyhightoughnessofatypicalfccHEABerndGludovatzetal.Science2014,345:1153Thefracturetou
6、ghnessofFeCoNiCrMnexceeds210MPa·m-1/2Abnormallow-temperaturemechanicalpropertiesWiththedecreaseoftestingtemperature,bothtensilestrengthandductilityareincreased;Thefracturetoughnesskeptalmostunchanged;Highyieldstrengthattemperaturesupto1600oCThestrongresistancetohigh-temperatures
7、oftening,ascomparedtothesuperalloysPromisinghigh-temperaturemechanicalpropertiesofbccHEAsSenkovetal.Intermetallics2011;19:698-706Ta34Nb33Hf8Zr14Ti11HEApossessesanbody-centeredcubicstructureoflatticeparametera≈3.36?.ItisatypeIIsuperconductorwithatransitiontemperatureTc≈7.3KP.Ko?e
8、ljetal.PRL2014,113:107001Interestingphysicalpro
