作　　者： ; ;

机构地区： 中南工业大学材料科学与工程系

出　　处： 《中南工业大学学报》 1999年第2期179-181,共3页

摘　　要： 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 change of mechanical behavior and microstructure of Al 4.43Mg 0.41Sc alloy during superplastic deformation has been studied. The results show that the alloy exhibits excellent superplasticity in a wide range of temperature and initial strain rate. Its maximum elongation may be up to 396% under tensile deformation with initial strain rate 1.67×10 -3 s -1 at temperature 520 ℃. The TEM observation of the microstructure changes revealed that the superplasticity obtained was induced by the dynamic recrystallization which occurred in the early stage of deformation. The whole deformation process can be divided into three stages of subgrain superplasticity, transition and fine grain superplasticity.

关 键 词： 钪 铝合金 超塑变形 显微组织 铝镁合金

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺] [金属学及工艺] [一般工业技术] [金属学及工艺]