变形Mg-1.5Zn-0.2Gd合金的组织性能及再结晶过程  

Texture and Recrystallization of Rolled Mg-1. 5Zn-0. 2Gd Alloy

作　　者：蔡正旭[1] 唐荻[1] 江海涛[1] 

机构地区：[1]北京科技大学高效轧制国家工程研究中心,北京100083

出　　处：《华南理工大学学报（自然科学版）》2013年第10期79-84,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家"十二五"科技支撑计划项目(2011BAE22B00)

摘　　要：利用金相显微镜、SEM和万能拉伸机等手段对Mg-1.5Zn-0.2Gd合金热轧、退火后的显微组织、结晶组织及力学性能等进行了研究。结果表明:Mg-1.5Zn-0.2Gd合金经450℃热轧和350℃退火60 min后,其性能得到显著提高,织构极密度显著降低,最大值仅为2.3;基面织构沿着TD方向发生分裂,角度大约为30°;经热轧、退火处理的合金在室温下的屈服强度和抗拉强度低于热轧状态,但表现出良好的延伸性,延伸率达29.1%;退火过程中非基面取向的晶粒在原始大角度晶界位置形核长大,是Mg-1.5Zn-0.2Gd合金织构得到优化的关键原因.The microstructure,crystal structure and mechanical properties of the hot rolled and annealed Mg-1.5Zn-0.2Gd alloy were investigated by using a metallographic microscope,a SEM and a universal tensile machine.The results show that （1） after Mg-1.5Zn-0.2Gd alloy is rolled at 450℃ and subsequently annealed at 350 ℃ for 60 min,the mechanical properties are significantly improved,the texture intensity significantly weakens with a maximum of only 2.3,and the TD split texture appears at ＋ 30° ; （2） as compared with the alloys rolled at 450 ℃,the hot rolled and annealed alloy is of lower yield strength and tensile strength at the room temperature but displays an excellent elongation which is up to 29.1％ ; and （3） during the annealing,the nucleation in non-basal orientation occurs around the pre-existing grain boundaries,which accounts primarily for the optimized texture of the Mg-1.5Zn-0.2Gd alloy.

关 键 词：MG-1 5Zn-0 2Gd合金 热轧 退火 再结晶 织构 力学性能 

分 类 号：TG111[金属学及工艺—物理冶金]