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研究了工业态AZ31镁合金在温度 6 2 3～ 72 3K和应变速率 1× 10 -5～ 1× 10 -3 s-1范围内的超塑性变形行为。结果表明 ,工业态AZ31镁合金表现出良好的超塑性 ,其最高断裂延伸率达到 314%,应变速率敏感指数达 0 .4。显微组织观察和断口分析表明 ,工业态AZ31镁合金超塑变形主要由晶界滑动机制所控制 ,同时 ,动态再结晶也是合金超塑变形的一种协同机制。
The superplastic deformation behavior of industrial AZ31 magnesium alloy at a temperature of 6 2 3 ~ 72 3K and a strain rate of 1 × 10 -5 ~ 1 × 10 -3 s -1 was studied. The results show that the industrial AZ31 magnesium alloy shows a good superplasticity, the maximum elongation at break reaches 314% and the strain rate sensitivity index reaches 0.4. Microstructure observation and fracture analysis show that the superplastic deformation of the industrial AZ31 magnesium alloy is mainly controlled by the grain boundary sliding mechanism and the dynamic recrystallization is also a synergistic mechanism of the superplastic deformation of the alloy.