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

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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