modeling microstructure evolution in engineering materials(1998).pdf

《modeling microstructure evolution in engineering materials(1998).pdf》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、ADVANCbSINAPPLIEDMECHANICS,VOLUME76ModelingMicrostructureEvolutioninEngineeringMaterialsALANC.F.COCKSandSIMONP.A.GILLandJINGZHEPANI.Introduction......................................8211.MicroscopicConstitutiveLaws....................,......84A.DiffusionalProcesses............................

2、..86B.InterfaceReactions..............................,.88C.MigrationofInterfaces..........,...................89111.ThermodynamicVariationalPrinciple.......................90IV.NumericalModels.........................,........95A.GrainBoundaryDiffusionControlledProcesses................96B.C

3、oupledGrainBoundaryandSurfaceDiffusion.......,........101C.InterfaceReactions................................111D.CoupledGrainBoundaryDiffusionandSelf-Diffusion............114E.GrainBoundaryMigration............................116F.EffectofChangesinElasticStoredEnergyonMicrostructureEvolution

4、..136V.Rayleigh-RitzAnalyses...............................150VI.StructureofConstitutiveLawsfortheDeformationofEngineeringMaterials.......................,........I54A.Stage1CompactionofCeramicComponents.................I56VII.ConcludingRemarks......................,..........I59References...

5、...................................16082AlanC.F:Cocksetal.I.IntroductionInrecentyearstherehasbeenagrowinginterestinmodelingthemicroscopicprocessesthatoccurwithinamaterialwhenitisprocessedorsuffersinelasticdeformationanddamagegrowthundermechanicalloading.Duringprocessing,itisoftenimportanttoco

6、ntrolcertainfeaturesofthemicrostructure.Asimpleexampleisthegrainsize,whichcanhaveasignificantinfluenceonarangeofmechanicalandelectricalproperties(HoneycombeandBhadeshia,1995;SpriggsandDutta,1974;Heywang,1971).Itisthereforeimportanttodevelopappropriatekineticrelationshipsthatcanpredicttheevolu

7、tionofthegrainstructure.Incom-ponentsprocessedbyapowderroutethesizeandshapeoftheevolvingporositymustalsobeconsideredandtheinfluenceofthisonthegrainstructureandproper-tiesofthefinishedcomponentevaluated(DuandCocks,1992).Inalloysystemscarefulco