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478Vol.47No.8 20118990—996ACTAMETALLURGICASINICAAug.2011pp.990–996 AZ31Æ ∗ 1,2)1,2)1)1)1)1)1) 1),410083 2) ,410083 AZ31423K523K,OMSEM/EBSD .,,, ,Æ;,Æ; .6523K1000s,, 46µm10µm,1/4,., 19.01%24%,,. ,,,, TG146.2A0412−1961(2011)08−0990−07 STRUCTUREEVOLUTIONOFAZ31MgALLOYSHEET DURINGBIDIRECTIONALCYCLICBENDINGATLOW TEMPERATUREANDSUBSEQUENTANNEALING ZHANGLei1),YANGXuyue1,2),HUOQinghuan1),TIANFang1),ZHANGYujing1), ZHOUXiaojie1),CHENJia1) 1)SchoolofMaterialsScienceandEngineering,CentralSouthUniversity,Changsha410083 2)KeyLaboratoryofNonferrousMetalMaterialsScienceandEngineering,MinistryofEducation,CentralSouth University,Changsha410083 Correspondent:YANGXuyue,professor,Tel:(0731)8830136,E-mail:yangxuyue@csu.edu.cn SupportedbyNationalNaturalScienceFoundationofChina(No.51071182) Manuscriptreceived2011–01–17,inrevisedform2011–04–13 ABSTRACTInthiswork,microstructureandtextureevolutioninthesheetsofMgalloyAZ31 wasstudiedbymeansofbidirectionalcyclicin–planebendingat423Kfollowedbyannealingat 523K.ThedeformedandsubsequentannealedmicrostructureswereinvestigatedbyOMand SEM/EBSDexaminations.Theresultsshowedthattwinningisthedominantdeformationmecha- nism.Withtheincreaseofdeformationpass,moreandmoretwinswereproducedinthegrainsnear thesurfacesofthesheetsandfinallythesegrainswereseriallydividedupbytwinningintersections. Butonlyafewtwinswereformedinthegrainsofthemiddleofthesheetsduetorelativelylowerstrain. Finally,agradientstructurewithhigh–densitytwinsintheregionsnearthesurfacesand,incontrast, lowerdensityonesinthecenterofthesheetswereinduced.After6passbend