AZ31镁合金循环冷轧及退火的组织和织构演变  

Microstructure and texture evolution of magnesium alloy AZ31 during repeated cold rolling and subsequent annealing

作　　者：胡维[1] 孟利[2] 李萧[3] 陈冷[1] HU Wei MENG Li LI Xiao CHEN Leng(School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China Central Iron ＆ Steel Research Institute, Beijing 10081, China Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]钢铁研究总院,北京100081 [3]北京科技大学工程技术研究院,北京100083

出　　处：《中国体视学与图像分析》2016年第3期263-271,共9页Chinese Journal of Stereology and Image Analysis

基　　金：国家自然科学基金资助(No.51201007);高等学校博士学科点专项科研基金(No.20100006120023);中央高校基本科研业务费(No.FRF-TP-12-045A)

摘　　要：变形镁合金通常形成较强单一性的织构,影响镁合金的深加工和应用,弱化织构强度的同时细化晶粒尺寸是有效提高室温延展性的途径。本文对商业AZ31镁合金板材进行循环小道次冷轧和退火处理,研究了该过程中的显微组织和织构演变,结果表明：4次循环处理使得平均晶粒尺寸从~52μm降低到~10μm,织构由初始的柱面织构转变为低强度的基面织构。压缩孪生与再结晶的交替作用促进了晶粒细化及基面织构漫散。Wrought magnesium alloys usually have a strong monotonic texture and thus their deep process-ing and applications are extremely restricted. Weakening the texture intensity and refining the grain size simultaneously are the effective solutions to improve the room temperature workability of alloys. We processed commercial AZ31 alloy sheets with repeated cold rolling and subsequent annealing using a small pass reduction. Then the evolution of microstructures and textures during these processes were investigated. Our results show that the average grain size was refined from about 52 μm to about 10 μm after 4times repeated processes,and the texture component changed from prismatic to basal with intensity decreased. The grain refinement and scattered texture are ascribed to the alternating compression twin and recrystallization.

关 键 词：镁合金 循环冷轧 退火 晶粒细化 孪晶 织构 

分 类 号：TG146.22[一般工业技术—材料科学与工程]