【摘要】 通过超塑性刚性凸模胀形实验研究了AZ31B镁合金板材的超塑性成形极限。在变形温度为573K,初始变形速率为3.3×10-4s-1的条件下,建立了AZ31B镁合金板料成形极限实验曲线(FLC),并且得到无论在拉压变形方式或是在双向受拉变形方式下超塑性变形时,AZ31B镁合金板料发生集中性失稳的条件均是d2ε=0。更多还原

【Abstract】 The superplastic bulging test of AZ31B magnesium alloy sheet of 0.6mm thick was carried out on Alliance RT/50 tensile machine at 573K and 3.3×10-4s-1.the superplastic forming limit diagram(FLD)at 573K and 3.3×10-4s-1 was established for the first time.It is found that,either in tensile-compressive deformation or in bi-axis tensile deformation,the judgment criterion for local necking of superplastic deformation is dε2=0.更多还原