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ID:37014197
大小:1.65 MB
页数:8页
时间:2019-05-13
《有应力作用时效下的ni4ti3相沉淀行为模拟》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、TransactionsofNonferrousMetals受Av·ai:labl;eo,nSlinecaitewwnwc.secieDnceidrierect.ctornSocietyofChinaPressTrans.NonferrousMet.Soc.China22(2012)2578—2585www.tnmsc.cnModelingofNiaTi3precipitationduringstress-freeandstress--assistedagingofbi·-crystallineNiTishapememoryalloysKEChang.bo一,CAOShan.sha
2、n。MAXiao,ZHANGXin-ping,1.SchoolofMechanicalandAutomotiveEngineering,SouthChinaUniversityofTechnology,Guangzhou510640,China;2.SchoolofMaterialsScienceandEngineering,SouthChinaUniversityofTechnology,Guangzhou510640,ChinaReceived9July2012;accepted6August2012Abstract:Thephasefieldmethodwasappliedt
3、ostudythemicrostructureevolutionofNi4Ti3precipitatesduringstress-freeandstress.assistedagingofbi.crystallineNiTishapememoryalloys(SAMs)withtwodiferentinitialNi-contentsof51.5%and52.5%(molefraction),respectively.Thesimulationresultsshowthat,duringstress—freeagingoftheNiTialloywithalowsupersatur
4、ationofNi(i.e.,Ti一51.5%Ni),theNi4Ti3precipitatesexhibitaheterogeneousdistributionwithahighnumberdensityofparticlesatthegrainboundary,leavingmostofthegraininteriorsfreeofprecipitates;whilefortheNiTialloywithahighsupersaturationofNi(i.e.,Ti一52.5%Ni),theNi4Ti3preci[)itatesshowahomogeneousdistribu
5、tionacrosstheentiresimulationsystem.Thestress-assistedagingcangiverisetohomogeneousdistributionoftheprecipitates,regardlessoftheinitialNi—content;however,thedistributionofvarianttypewithinthetwograinsisheterogeneous.Keywords:NiTishapememoryalloy;Ni4Ti3precipitate;low-anglegrainboundary;martens
6、itictransformation;phasefieldsimulationdeformation『41.ThestudyoftheinfluenceofNi4Ti3on1Introductionmartensitic仃ansformationwasmainlyperformedbyexperimenta1observationandcharacterizationsuchasNear.equiatomicNiTialloyshaveattractedagreatdiferentialscanningcalorimetry(DSC)andinsitudeaIofinterests
7、inthepastdecadesonaccountoftransmissionelectronmicroscopy(TEM)[5—7】.Thusfar,excellentshapememoryefectandsuperelasticproperty.ithasbeenwellrecognizedthatthemartensiticTheyhavebecomeoneofthemostimportantmetaltransformationbehaviorinNiTiSM
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