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时间:2020-05-01
《Ni64Al21V15沉淀过程DO22向L10(M=1)结构转变的微观相场模拟(英文).pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、RareMetalMaterialsandEngineeringAvailableonlineatwww.sciencedirect.comVolume42。Issue6,June2013OnlineEnglisheditionoftheChineselanguagejourna蛳ScienceDirectCitethisarticleas:RareMetalMaterialsandEngineering,2013,42(6):1113-1117MicroscopicPhase--FieldSimulationoftheStructureTransformationfromD022
2、toLlo(M=I)PhaseinNis4AI21V1sAlloyChangXiuli,WangYongxin,ChenZheng,ZhangJing,ChengLiweiStateKeyLaboratoryofSolidificationProcessing,NorthwesternPolytechnicalUniversity,Xi'an710072,ChinaAbstract:ThestructuretransformationfromDO22toL10(^仁1)phaseinNi64A121V15alloyat1150Kwasstudiedbythemicro—scopic
3、phase—fieldkineticmode1.TheresultsshowthatL10(朋l-1)structureprecipitatesatinterphaseduringthemiddlestageoftheagingprocesswiththreetypesoftheformationmechanism.Firstly,theL10(1)structurewhichalignsalong【001]directionandnucleatesattheinterphaseofL12andDO22growstowardsD022phase.Secondly,theL10(1)
4、structurewhichalignsalong【001】directionnucleatesat90。ordereddomainboundaryofDO22phaseandexpandstothe[001]directionofDO22phase.Thirdly,theL10(^仁1)structurewhichalignsalong[100]directionnucleatesattheinterphaseoftwo[100]alignedDO22structure,andexpandstowardsDO22phase.ThephasetransformationfromDO
5、22structuretoL10(仁1)structureisaccomplishedbyatomicdiffusion.InaperfectDO22phase,thesiteismainlyoccupiedbyVatoms,whilethet22anda3sitesbyNiatomsandthealsitebyA1atoms.Astheagingprocessproceeds,Vatomswhichmigrateto0[2site,leadingtotheatomicorderingon(002)planetakestheplaceofbothanda2sitesultimate
6、ly,andtheNiatomsmigratefroma2to/21siteandoccupyboth121and/23siteslastly,whileA1atomsdiffuseto—wardsoutsideofDO22structurefacilitatingtheformationofhighlyorderedLlo(仁1)structurefinally.Keywords:structuretransformation;L10(1)structure;orderparameter;Ni—A1-Valloy;microscopicphase—fieldmodelAsanim
7、portantaviationstructuremateria1.theNi—A1.Va1.systemtendingtoward【jJ.ThisshowstheDO,,structurewill1oyexhibitsmuchoutstandinghightemperatureperformanceeventuallyexistindifferentformswithdiferentconditions.attributingtoitsspecificinternal
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