Mg-Gd-Y-Zr合金在773和823K热处理时的氧化行为  

Oxidization of Mg-Gd-Y-Zr alloy during heat treatment process at 773 and 823 K

作　　者：邓运来[1,2] 杨柳[1,2] 郭天才[1,3] 李文瑛[1,3] 张新明[1,2] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]有色金属材料科学与工程教育部重点实验室,湖南长沙410012 [3]航天科工防御技术研究试验中心,北京100854

出　　处：《中南大学学报（自然科学版）》2010年第2期483-488,共6页Journal of Central South University:Science and Technology

基　　金：国家安全重大基础研究项目(5133001E;5233001E)

摘　　要：采用金相显微镜（OM）观察、X线衍射（XRD）、扫描电镜（SEM）和能谱分析（EDS）等分析测试技术，研究Mg—Gd-Y-Zr合金在773和823K热处理时的氧化行为。研究结果表明：合金热处理后表面氧化物的主要成分为Y2O3和Zr2Gd2O7的混合物；合金在773K保温48h热处理后，表面被轻微氧化，显微组织与热处理前无明显差别；合金在823K保温48h热处理后表面氧化严重，形成较厚氧化层，氧化层中沿晶界分布有很多尺寸为5～10μm的方形及形状不规则粒子；合金在773K热处理时不需用保护气氛，而在823K热处理需用保护气氛。The oxidation behavior of as-cast Mg-Gd-Y-Zr alloy during heat treatment process at 773 and 823 K was studied by using optical microscopy, X-ray diffraction, and scanning electron microscopy. The results show that the thin layer formed on the surface of Mg-Gd-Y-Zr alloy during heat treatment process is mainly composed of Y2O3 and Zr2Gd2O7. Being heat treated at 773 K for 48 h, the surface of Mg-Gd-Y-Zr alloy is oxidized so slightly that there are no many differences between surface layer and secondary surface layer while there is an oxidizing layer formed which contains a lot of RE-rich particles when being heat treated at 823 K for 48 h. Mg-Gd-Y-Zr alloy should be protected by other gases during heat treatment process at 823 K and need not be protected at 773 K.

关 键 词：Mg—Gd—Y合金 热处理 表面氧化 

分 类 号：TG174.3[金属学及工艺—金属表面处理]