第35卷第1期金属学报Vol.35No.11999年1月ACTAMETALLURGICASINICAJanuary1999Monel合金高速塑性剪切变形与动态再结晶3李强1)徐永波1,2)赖祖涵3)沈乐天2)白以龙2)1)中国科学院金属研究所材料疲劳与断裂国家重点实验室,沈阳1100152)中国科学院力学研究所非线性连续介质力学开放实验室,北京1000803)中国科学院国际材料物理中心,沈阳1100155-1摘要采用Hopkinson杆加载技术和帽状试样,研究Monel合金在εÛs≈4.3×10s的高应变速率条件下的应力-应变关系及塑性变形行为.实验及计算结果表明,塑性区(简称剪切带)内温度随剪切应变增加呈线性升高.透射电镜证实剪切带组织发生了动态再结晶,再结晶晶粒约为170nm.分析了剪切带中组织结构的演变过程,讨论了动态再结晶的机制1关键词高速塑性变形,剪切带,动态再结晶中图法分类号TG142.12,TG111.7,TG146.1文献标识码A文章编号0412-1961(1999)01-0049-52HIGHVELOCITYPLASTICDEFORMATIONANDDYNAMICRECRYSTALLIZATIONOFMONELALLOYLIQiang1),XUYongbo1,2),LAIZuhan3),SHENLetian2),BAIYilong2)1)StateKeyLaboratoryforFatigueandFractureofMaterials,InstituteofMetalResearch,TheChineseAcademyofSciences,Shenyang1100152)LaboratoryforNon-LinearMechanicsofContinuousMedia,InstituteofMechanics,TheChineseAcademyofSciences,Beijing1000803)InternationalCentreforMaterialsPhysics,TheChineseAcademyofSciences,Shenyang110015Correspondent:LIQiang,post-doctor,Tel:(024)23843531-55659,Fax:(024)23891320,E-mail:qli@imr.ac.cnManuscriptreceived1998-01-19,inrevisedform1998-04-13ABSTRACTTheplasticdeformationbehaviorandstress-strainresponsecharacteristicsofMonelalloyat5-1highstrainrate(εÛs≈4.3×10s)arestudiedusingHopkinsonbarandhat-shapedspecimen.Thetem2peraturearisingfromtheadiabaticheatingwithintheshearbandiscalculatedandincreasesalmostlinearlywithplasticshearstrain.Thesmallrecrystallizedgrains(170nmindiameter)withinthecentreoftheshearbandandtheelongatedcellstructuresinthetransitionzonebetweenthecenteroftheshearbandandmatrixareobservedbyTEM.Itissuggestedthatthemicrostructureevolutionduringplasticdeformationareasfollows:first,largeamountofdislocationsareproducedandinhomogenouslydistributedintheband;second,elongated/equiaxedcellsareformed,thensmallnuleiareappearedandtheirgrowthrateiscon2trolledbythestrainrate;finallycrackingoccursalongtheshearband.KEYWORDShighvelocityplasticdeformation,shearband,dynamicrecrystallization材料高应变速率变形行为和对应的组织结构演变的研带中现了动态再结晶组织.然而,关于快速塑性剪切变形究近些年十