通过热轧工艺制备了具有细晶微观组织的AZ31镁合金薄板.在250～450℃的温度范围和0.7×10-3～1.4×10-1s-1的初始应变速率范围内研究了热轧AZ31镁合金板的超塑性流变行为.分别通过光学显微镜和扫描电镜(SEM)观察了AZ31镁合金超塑性变形中的微观组织演变和断裂行为,并计算了不同温度下的变形激活能.结果表明,从300℃开始,热轧AZ31镁合金开始表现出超塑性的流变特征.在400℃,0.7×10-3s-1的变形条件下,最大延伸率可达362.5%,显示了良好的超塑性能.在300～400℃的超塑变形温度范围内,AZ31镁合金超塑变形的主要机制是由晶界扩散控制的晶界滑移,而变形温度和应变速率对AZ31镁合金断裂行为的影响主要体现在变形机制从晶内滑移到晶界滑移的转变.
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