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1、第29卷第1期材料热处理学报Vol.29No.12008年2月TRANSACTIONSOFMATERIALSANDHEATTREATMENTFebruary2008轧制及退火处理对铸轧态AZ31镁合金组织的影响1,212112娄花芬,汪明朴,马可定,郭明星,唐宁,刘阳(1.中南大学材料科学与工程学院,湖南长沙410083;2.中铝洛阳铜业有限公司,河南洛阳471039)摘要:利用金相显微镜、SEM及TEM对铸轧态AZ31镁合金在不同轧制及退火状态下的显微组织进行了研究。结果表明:铸轧态AZ31合金在420℃进行轧制变形时,合金以动态再结晶为
2、主,且随着轧制变形量的增加,等轴再结晶晶粒尺寸逐渐变小。变形量为40%时,析出相得到破碎,晶界也变得更加清晰,此外,局部区域还出现了等轴再结晶晶粒;当变形量增大到90%时,合金以细小的等轴再结晶晶粒为主,晶粒尺寸约为10μm,且TEM观察可知合金基体内分布有较多细小的析出相,部分粗大再结晶晶粒边界附近还分布有一些由于动态再结晶而形成的细小晶粒。铸轧态AZ31合金在420℃轧制变形90%后再进行不同温度的退火,可知随温度升高再结晶晶粒长大明显,到450℃退火时,晶粒长大到20～30μm,对此退火样进行300℃温轧,基体内出现大量的孪晶和亚晶组
3、织。关近词:镁合金;铸轧;轧制变形;孪晶;亚晶中图分类号:TG146122文献标识码:A文章编号:100926264(2008)0120062204Effectofrollingandheattreatmentonmicrostructureofroll2castAZ31alloy1,212112LOUHua2fen,WANGMing2pu,MAKe2ding,GUOMing2xing,TANGNing,LIUYang(1.SchoolofMaterialsScienceandEngineering,CentralSouthUniversi
4、ty,Changsha410083,China;2.CHINALCOLuoyangCopperCoLtd,Luoyang471039,China)Abstract:Themicrostructureofroll2castAZ31alloyunderrollingandannealingconditionswerestudiedbymeansofopticalmicroscope,SEMandTEM.Theresultsshowthatasrollingat420℃,dynamicrecrystallizationoccursintheall
5、oy,andwiththeincreaseofdeformationamount,thesizeofrecrystallizedequiaxedgrainsformedintheroll2castAZ31alloyaregraduallyrefined.Whendeformationamountis40%,someprecipitatedphasesarebroken,itsoriginalgrainboundaryobviouslybecomessharper,andfineequiaxedrecrystallizedgrainsareo
6、bservedinsomelocalareas.Asdeformationamountincreasingto90%,fineequiaxedrecrystallizedgrainprevailsinthemicrostructurewiththegrainsizeof10μm.Alargenumberoffineprecipitatedphasesareobservedinthealloydeformed90%byTEM,andsomefinegrainsgeneratedbydynamicrecrystallizationdistrib
7、utearoundtheboundaryofcoarserecrystallizedgrains.Afterannealingatdifferenttemperatures,thesizeoftherecrystallizedgrainsincreaseswiththeincreaseofannealingtemperature.Asannealingtemperaturereaching450℃,thegrainsizeisabout20～30μm.Afterrollingat300℃,lotsoftwinsandsubgrainscan
8、befoundinthematrixofthealloy.Keywords:Mgalloy;roll2cast;rollingdeformation;twin;subgrain变
