(上海交通大学 轻合金精密成型国家工程研究中心，
上海 200030)
摘 要: 研究了工业态AZ31镁合金在温度623～723K和应变速率1×10-5～1×10-3s-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。
关键字: 超塑性；AZ31镁合金；晶界滑动；动态再结晶
commercial magnesium alloy AZ31
（Light Alloy Net Forming National Engineering Research Center,
Shanghai Jiaotong University, Shanghai 200030, China）
Abstract:Superplastic behavior of a commercial AZ31 magnesium alloy is investigated at temperatures ranging from 623 to 723K and strain rates ranging from 10-5 to 10-3s-1. The results showed that the alloy exhibits excellent super plasticity, and the maximum elongation-to-failure reaches 314%. The alloy also shows a high strain rate sensitivity exponent of 0.4. Microstructural observations suggest that grain boundary sliding (GBS) makes a substantial contribution to the superplastic deformation, and the dynamic recrystallization is the accommodated mechanism for the deformation.
Key words: superpalsticity; AZ31 magnesium alloy; grain boundary sliding; dynamic recrystallization
