Mg-10Gd-2Y-0.6Zr合金热压缩变形与其微观组织  

Hot-Compression Behavior and Microstructure of Mg-10Gd-2Y-0.6Zr Alloy

作　　者：张津[1] 于戈[1] 吴超云[1] 赵祖德[2] 舒大禹[2] 康凤[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]中国兵器工业第五九研究所,重庆400039

出　　处：《中国稀土学报》2009年第4期546-551,共6页Journal of the Chinese Society of Rare Earths

基　　金：总装备部预研基金资助项目(9140A18060409QT0202)

摘　　要：采用热压缩模拟试验,对Mg-10Gd-2Y-0.6Zr镁合金在350～450℃,变形程度为40%,变形速率在0.001～0.5s-1条件下的热压缩变形规律进行了研究,对变形后的微观组织进行了金相分析,对显微组织中的第二相进行了扫描能谱成分分析,对变形后试样的硬度进行了测试,根据热加工动态回复再结晶的特点和稀土合金相的作用,分析了该合金的微观组织结构和变形行为。结果表明:热压缩变形温度和速率对合金硬度值总的影响不大,但在相同温度下,有速率越大硬度越大的趋势;该合金在350℃,400℃时变形速率为0.1s-1时晶粒异常粗大,在400℃变形速率大于0.5s-1或变形温度450℃,变形速率为0.1s-1下进行热压缩,该合金可以得到组织结构均匀和热塑性成型良好的匹配。The Mg-10Gd-2Y-0. 6Zr alloy was hotcompressed in the range of 350 - 450℃ at a constant strain rate from 0.001 s-1 to 0.5 s^-1. The flow behavior and mierostructure evolution during hot deformation were investigated in terms of the characteristic of dynamic recovery and recrystallization and the usefulness of rare earth phase. The microstructure after hot compression was observed by microscope and the second phase of rare earth was examined by SEM, in addition, its constitution was analyzed by EDX. The hardness of the alloy after deformation was measured. The results showed that the grain was very large at deformation temperature of 350- 400℃ when the deformation rate was 0.1 s-1. The better match of microstructure and hot plastic property could be realized when temperature was 450℃ and deformation rate was 0.1 s^- 1

关 键 词：稀土镁合金 热压缩变形 微观组织 动态回复再结晶 

分 类 号：TG146[一般工业技术—材料科学与工程]