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.
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