(上海交通大學(xué) 輕合金精密成型國家工程研究中心，
上海 200030)
摘 要: 研究了工業(yè)態(tài)AZ31鎂合金在溫度623～723K和應(yīng)變速率1×10-5～1×10-3s-1范圍內(nèi)的超塑性變形行為。結(jié)果表明，工業(yè)態(tài)AZ31鎂合金表現(xiàn)出良好的超塑性，其最高斷裂延伸率達(dá)到314%，應(yīng)變速率敏感指數(shù)達(dá)0.4。顯微組織觀察和斷口分析表明，工業(yè)態(tài)AZ31鎂合金超塑變形主要由晶界滑動機制所控制，同時，動態(tài)再結(jié)晶也是合金超塑變形的一種協(xié)同機制。
關(guān)鍵字: 超塑性；AZ31鎂合金；晶界滑動；動態(tài)再結(jié)晶
commercial magnesium alloy AZ31
WU Guo-hua, ZHU Yan-ping, DING Wen-jiang
（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
