异步轧制AZ31镁合金板材室温冲压性能研究  

Research on drawability of AZ31 magnesium alloy sheet processed by differential speed rolling at room temperature

作　　者：张文玉[1] 刘先兰[1] 陈振华[2] 

机构地区：[1]湖南工学院机械工程系,衡阳421002 [2]湖南大学材料科学与工程学院,长沙410082

出　　处：《塑性工程学报》2007年第4期6-10,共5页Journal of Plasticity Engineering

基　　金：湖南省教育厅科研资助项目(06C031)。

摘　　要：文章主要对异步轧制AZ31镁合金板材室温冲压性能进行了研究,以探讨提高镁合金板材冲压性能的途径。结果表明,异步轧制有利于板材的晶粒细化,其晶粒尺寸约为7.6μm,明显小于普通轧制板材的12.5μm;而由于异步轧制过程中剪切变形的作用,异步轧制使板材的(0002)基面晶粒取向减弱;与普通轧制相比,异步轧制板材的应变硬化能力增加,屈服强度降低,制耳参数减小,但塑性应变比也降低,这可归因于异步轧制所导致的晶粒细化和晶粒取向的改变。The objective of this study is to investigate the method of improved drawability of AZ31 magnesium alloy sheet produced by differential speed rolling process at room temperature. The grain size of AZ31 magnesium alloy sheet was 7. 6μm, which was smaller obviously than that of 12.5μm processed by normal rolling. And （0002） basal grain orientation of AZ31 magnesium alloy sheet produced by differential speed rolling was weakened, which was owing to the shear deformation induced by this process. Compared with the normal rolling, the higher strain hardening exponent, lower yield ratio, decreasing earing parameter and plastic strain ratio could be related to the grain refinement and changing grain orientation, which induced by the differential speed rolling.

关 键 词：异步轧制 AZ31镁合金板材 冲压性能 变形行为 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG339[金属学及工艺—金属材料]