研究了晶粒尺寸为85μm的大晶粒AZ91镁合金在高温下的超塑拉伸变形行为.结果表明,大晶粒AZ91合金能在高温下获得超塑性.在350℃下,应变速率为3×10-4s-1拉伸时,最大伸长率达228%.300℃下40%的预应变可以改善合金在更高温度下的超塑性能.在超塑拉伸变形初期,动态再结晶细化了合金的晶粒,呈现出细晶超塑的特征;随着应变量的增加,合金的晶粒长大趋势不明显.大晶粒AZ91合金的超塑性变形机制是晶界滑移控制下的孔洞连接协调机制.
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