微观相场法研究镍基合金沉淀相间作用的定向粗化机制（英文）.pdf

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1、Availableonlineatwww．sciencedirect．comTransaetionsofScienceDirectNonferrousMetalsSocietyofChinaELSEⅥERPressTrans．NonferrousMet．Soc．China23(2013)193—200WWw，tnmsc．cnMicroscopicphase—fieldstudyondirectionalcoarseningmechanismcausedbyinteractionbetweenprecipitatesinNi‘——A1‘——ValloyKtmYA

2、NG,ZhengCHEN，Yong—xinWANG,Xiao-liFANStateKeyLaboratoryofSolidificationProcessing，NorthwesternPolytechnicalUniversity,Xi’an710072，ChinaReceived29December2011；accepted12March2012Abstract：Amicroscopicphase—fieldmode1wasusedtoinvestigateadirectiona1coarseningmechanismcausedbytheanisotro

3、picgrowthoflongperiodstackinganddifferentefectsofphasesonprecipitationinNi—Al—Valloy~TheresultsshowthatD0，，mainlycoarsensalongitsshortaxis，whichmaypresstheneighboringL12，leadingtotheinteractionamongatoms．DifusionchannelsofAlareformedinthedirectionwherethemismatchbetweenyandyreduces；

4、theoccupationprobabilitiesareanisotropicinspace；anddirectioncoarseningofL12occursfinally．Withariseofageingtemperature，phasesappearlaterandD022ismuchlateratahighertemperature．theaverageoccupationprobabilitiesofAlandVreduce．andAlchangesmorethanVKeywords：nickel—basedalloys；microscopicp

5、hase—fieldsimulation；directionalcoarsening；anisotropicgrowth；mismatch；diffusionBROWN[11]andVOORHEESetal[12]investigatedalIntrOductiOnheterogeneouselasticsystem．especiallyinthenanostressfield．Moreover,directiona1diflusioncausedwith)，(L12)isthemainstrengthenedphaseofstress，anisotropic

6、growthoftheyphase，andsoonwerenicke1．basedsuperalloyswhichhavesignificantlyraisedreportedmoreinthisfield『13—151．Theorientedgrowthoperatingtemperatureandeficiencyduetotheirofvwithoutstressisalsofoundintheexperimentofexcellentpropertiesinservice．anditmayforlTlorientedCMSX一4alloy『16]．In

7、thisexperiment，theelementsRegrowthwhenstressexists[卜5]．RaftingistheorientedandWwhichhavelargeratomicradiiareaddedtothegrowthofphases，whichiscausedduringthediffusionofsystem．andthephaseswithdiferentcrystalstructureselements．Stressmayinduceelementstodifluseinaform．Stressafectselements

8、diferentlyforthesep