论文部分内容阅读
研究了含微量Ｓｃ元素的ＡｌＭｇ合金在超塑变形过程中的力学行为和显微组织．结果表明：合金可在较宽温度和应变速率范围内获得良好的超塑性．在温度为５２０℃，初始应变速率为１６７×１０－３ｓ－１条件下拉伸变形时最大延伸率可以达到３９６％．显微组织分析发现，合金的超塑性效应是由变形初期的动态再结晶诱发产生，其超塑变形过程可分为亚晶超塑性阶段、过渡阶段和细晶超塑性阶段．
The mechanical behavior and microstructure of AlMg alloy containing trace Sc element during superplastic deformation were studied. The results show that the alloy can obtain good superplasticity at a wide range of temperature and strain rate. The maximum elongation can reach 396% at the temperature of 520 ℃ and the initial strain rate of 167 × 10-3s-1. Microstructure analysis shows that the superplastic effect of the alloy is induced by the dynamic recrystallization during the initial stage of deformation, and the superplastic deformation process can be divided into the sub-superplastic phase, transitional phase and fine-grained superplastic phase.