加入Ld、RE和Sb对镁合金AZ91D显微组织的影响  

Effects of La,RE and Sb Addition on Microstructure of AZ91D Magnesium Alloy

作　　者：张代东[1] 原洪加[1] 宫长伟[1] 郑建军[1] 闫志杰[1] 

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024

出　　处：《铸造》2009年第3期273-275,278,共4页Foundry

基　　金：山西省科技攻关项目(051125)

摘　　要：镁合金晶粒尺寸的大小对强度的影响较大,细化镁合金的晶粒可显著提高其力学性能。主要研究了加入稀土La和混合稀土RE以及细化晶粒元素Sb对镁合金AZ91D显微组织的影响。结果表明,稀土和Sb合金化所产生的(Al,Mg)11La3相、Mg3Sb2相、Al4RE相等大多以针状和杆状偏聚在晶界上,阻碍了晶粒的长大,起到改善晶粒和强化晶界的作用,合金经时效处理后得到均匀分布的短棒状的沉淀相,产生了沉淀强化效应。Grain size has great effect on the strength of magnesium alloy and grain refinement can enhance mechanical properties of Mg alloy. The effects of La, RE addition on grain refinement of containing Sb AZ91D magnesium alloy were studied in the paper. The results show that when the grain becomes finer, the Second phase particles, such as （Al, Mg ）11La3, Mg3Sb2, Al4RE will mostly segregate around the grain boundary. These precipitates are needle or strip shape, which restrict the grain growth and improve the boundary strength. After aging treatment, the stick-like precipitates are distributed evenly in the matrix, and the effect of precipitation strengthening is attained.

关 键 词：AZ91D镁合金 稀土元素 显微组织 固溶处理 时效处理 

分 类 号：TG113[金属学及工艺—物理冶金]