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时间:2020-04-30
《Al-Zn-Mg-0.25Sc-Zr合金的热压缩变形行为和微观组织演化(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、Availableonlineatwww.sciencedireet.c0m一拶Transaetionsof冁秽ScienceDirectNonferrousMetalsSocietyofChinaPressTrans.NonferrousMet.Soe.China22(2012)1556—1562www.tBITISC.CnHotdeformationbehaviorandmicrostructuralevolutionofA1一Zn—Mg一0.25Sc—Zralloyduringcompressio
2、natelevatedtemperaturesZHANGZhi—ye,PANQing—lin’。,ZHOUJian,LIUXiao.yan,CHENQin1.SchoolofMaterialsScienceandEngineering,CentralSouthUniversity,Changsha410083,China;2.KeyLaboratoryofNonferrousMaterialsScienceandEngineeringofMinistryofEducation,CentralSouthU
3、niversity,Changsha410083,ChinaReceived18July2011;accepted28October2011Abstract:ThehotdeformationbehaviorofA1一Zn—Mg一0.25Sc—Zralloyanditsmicrostructuralevolutionwereinvestigatedbyisothernla1axisymmetrichotcompressiontestsattemperaturesfrom340to500。Candstra
4、inratesrangingfrom0.001to10s.Thesteadyflowstressincreasedwithincreasingthestrainrateordecreasingthedeformationtemperature,whichcanbedescribedbyahyperbolic.sineconstitutiveequationwiththedeformationactivationenergyof150.25kJ/mo1.Thetendencyofdynamicrecrys
5、tallizationenhancedathighdeformingtemperaturesand1owstrainrates.whichcorrespondedtolowZvalues.WithdecreasingZvalue.themainsofteningmechanismofthealloytransformedfromdynamicrecoverytodynamicrecrystallization,correspondingly,thesubgrainsizeincreasedandthed
6、islocationdensitydecreased.Keywords:AI—Zn-Mg—Sc—Zralloy;hotdeformation;flowbehavior;microstructuralevolutionindicatedthatthehighstrengthofthealloywasmainly1IntroductionassociatedwiththefinegrainstrengtheningcausedbytheadditionofScandZr,thesubgrainstrengt
7、heningandNovelAl—Zn—Mg—Sc—ZralloyhasbeendevelopedprecipitationstrengtheningofA13(Sc,zr)particlesandbyaddingasmallamountofscandiumandzirconiumonprecipitates.However,systematicstudiesonthethebaseofmedium.strengthweldableA1-Zn——Mgalloy.deformationbehavioran
8、dmicrostructuralevolutionofThealloyhashighstrength,goodcorrosionresistanceA1一Zn-Mg—Sc—Zralloyduringhotcompressionhaveandweldingperformance,belongingtoaneweraofnotbeenreportedyet.Thereislackofrelevanthigh—strengthweldablest
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