镁合金的超塑性与损伤定量分析  

Superplasticity and Quantitative Analysis of Cavity Damage on Magnesium Alloy

作　　者：宋美娟[1] 王智祥[1] 汪凌云[2] 向毅[2] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]重庆科技学院机械工程系,重庆400050

出　　处：《稀有金属》2006年第3期300-304,共5页Chinese Journal of Rare Metals

基　　金：重庆市科委自然科学基金(8413)资助项目

摘　　要：研究了轧制AZ31B镁合金板材的超塑性与空洞损伤,对拉伸试样在超塑性变形各阶段轴剖面的空洞进行了观察,通过对空洞演化的分析建立了空洞体积分数与变形程度的定量关系。研究结果表明:AZ31B镁合金板材在一定的变形条件下具有良好的超塑性;变形伴随着空洞的形核、长大,继而发生空洞的连接,导致材料断裂;空洞体积分数随着变形程度的增加呈指数规律变化。Superplasticity and the cavity damage of AZ31B magnesium alloy sheet were investigated. The cavity distributions over the longitudinal sections of tensile specimen with different elongations were observed by SEM. After quantitative analysis of the evolvement law of the cavity damage, a volume fraction of cavities as a function of true strain was established. It is found that a commercial rolling AZ31B magnesium alloy sheet has a favorable superplasticity, which is finally fractured due to the growth and interlinkage of cavities nucleated at grain boundary. A volume fraction of cavities increases by exponential law with true strain during superplastic deformation.

关 键 词：AZ31B镁合金 超塑性 空洞 

分 类 号：TG135.3[一般工业技术—材料科学与工程]