采用元胞自动机结合Laasraoui-Jonas位错密度模型模拟AZ31镁合金的动态再结晶行为.pdf

《采用元胞自动机结合Laasraoui-Jonas位错密度模型模拟AZ31镁合金的动态再结晶行为.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、Availableonlineatwww．sciencedirect．com一Transacfionsof酶ScienceDirectNonferrousMetalsSocietyofChinaTrans．NonferrousMet．Soc．China23(2013)2692—2699www．tnmsc．cnSimulationondynamicrecrystallizationbehaviorofAZ31magnesiumalloyusingcellularautomatonmethodcoupl

2、ingLaasraoui。——JonasmodelXiaoLIU，_，Luo．xingLI，-，Feng—yiHE，JiaZHOU’-，Bi．WllZHU，LiqiangZHANG，1，StateKeyLaboratoryofAdvancedDesignandManufacturingforV_ehicleBody,HunanUniversity,Changsha410082．China；2．CollegeofMechanicalandVehicleEngineering，HunanUniversi

3、ty,Changsha410082，China；3．CollegeofMechanicalandElectricalEngineering，CentralSouthUniversityofForestryandTechnology,Changsha410004，ChinaReceived25July2O12：acceptedlFebruary2013Abstract：Thedynamicrecrystallization(DRX)processofAZ3lmagnesiumalloyincludin

4、gmicrostructureanddislocationdensityevolutionduringhotcompressionwassimulatedbyadoptingthecellularautomaton(CA)methodcouplingtheLaasraoui-Jonas11odel(LJmode1)．Thereliabilityofsimulationdependedontheaccuracyofthehardeningparameter,therecoveryparameteran

5、dthestrainratesensitivityintheLJmode1．ThehardeningparameterwascalculatedintermsoftheLJmodelandtheKocks—Meckingmodel(KMmode1)，andthentherecoveryparameterandthestrainratesensitivitywereobtainedbyusingtheequationofsteadystateflowstressforDRX．Goodagreement

6、sbetweenthesimulationsandtheexperimentalobservationswereachieved．Kevwords：AZ31magnesiumalloy；dynamicrecrystallization；microstructure；simulationCarlo(MC)methodandthecellularautomatonfCA1lIntrOductiOnmethOd．TheMCmethodhasbeenwidelyadoptedtostudymicrostru

7、cturalevolution，forinstance，normalHighstackingfaultenergymetals(SFE)，suchasgraingrowth，graingrowthwithsecond-phaseparticles，aluminum，betastitaniumalloys，andferriticsteels，andrecrystallizationf10]．Severa1researchersf8，l11usedundergodynamicrecovery(DRV)r

8、atherthandynamicaMCmethodtostudyDRXindetail．includingtherecrystallizationrDRX)duringhotdeformation．Butforpredictionofthetransitionfromsingletomulti．Deaklow．andmedium-stackingfaultenergymetalssuchasflowcurves，theefectofinitialgrainsizean