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1、第45卷第n期今庵学玻V61.45No.112009年11月第1303一1308页ACI,AMETALLURGICASINICANov.2009PP.1303一1308镁合金温变形过程中的孪生及孪晶交叉杨续跃叨张雷l)l)中南大学材料科学与工程学院,长沙410832)中南大学有色金属材料科学与工程教育部重点实验室,长沙410083摘要对AZ31镁合金在3种温度(523,573和673K)下进行了单向压缩变形.在523K,当真应变达到0.咒时真应力一真应变曲线出现尖锐的应力峰值,在应力峰值之前先后经历了缓慢加工硬化(0.02三:<006
2、)和急剧加工硬化(0.06兰:<0.咒)2个阶段.利用SEM/EBSD技术分析了这2个阶段对应的显微组织.结果表明,在缓慢加工硬化阶段(:=0.03),仅有少量孪晶出现;在急剧加工硬化阶段(:=0.06),产生了大量{1012}孪晶,孪晶间的相互交叉导致材料产生急剧加工硬化.AZ31镁合金{10丁2}孪晶间交叉有5种可能存在的形式,孪晶的形成和交叉与压缩应力方向有密切关系.在基体应力方向分别为近似(11百O)和(10丁0)方向时确认了(10丁2)一(01丁2)和(10丁2)一(O丁12)2种交叉形式.关键词镁合金,温变形,孪生,孪晶交叉,
3、取向图中图法分类号TG一46龙文献标识码A文章编号0412一1961(2009)11一1303一06TWINNINGANDTWININTERSECTIONINAZ31MgALLOYDURING丫VARMDEFORMATIONYANG九夕祝el,2),z刀通万e五e:l)1)SehoolofMaterialsSeieneeandEngineering,CentralSouthUniversity,Changsha4100832)KeyLaboratoryofNonferrousMetalMaterialsSeieneeandEngineer
4、ing,MinistryofEdueation,CentralSouthUniversity,Changsha410083Co:resPondon亡:YANGXoyoe,尸r动三ssor,Tel:(oz)召召Joz,,E一a乞l:yangxoyoe回二a乞l.eso.ed二.enManuseriPtreeeived2009一05一05,inrevisedform2009一08一18ABSTRACTThougheleetronbaekseatteringdifraetion(EBSD)15widelyempl叮edfortheori-e
5、ntationanalysisofdeformedmierostrueturesinmanymetalliematerials,itsaPplieationstoMganditsalloysarenotwidesPreadbeeauseofthedifieultiesinvolvedinsamPlePreParation.Inthiswork,uniaxialeomPressiontestswerePerformedonsamPleseutalongtheextrusiondireetionfromAZ31Mgall叮bars,andth
6、enthetwinsandtheirinterseetionswereanalyzedbySEM/EBSDmieroseopy.DeformationanddeformationmeehanismsoperatinginMgalloydePendsensitivelyontemPeratures.Floweurveat523KshowsasharPerandlargerstressPeakfollowingslowstrainhardeningandraPidstrainhardening.Atslowhardeningstage(0.0
7、2三:<0.06)afewof{10丁2}twinningwaseommonlyobserved,butatrapidhardeningstage(0.06兰乙<0.22)moretwinsandtwininterseetionsappeared.TherearefivePossibletyPesoftwininterseetions,whicharestronglydependedonthestressdireetion.Thetwotypesof(10丁2)一(01丁2)and(10丁2)一(0丁12)twininterseetion
8、swereobservedatstressaxisnearto(11奋O)and(10丁O)inthesampleseompressedtoatruestrainOfO!06!KEYWORDS
