Zr含量对Mg-Gd-Y镁合金组织和性能的影响  

Effect of Zr Content on Microstructure and Mechanical Properties of Mg-Gd-Y Alloy

作　　者：董丽君[1] 吴安如[1] 张玉东[1] 高为国[1] 

机构地区：[1]湖南工程学院机械工程学院,湖南湘潭411101

出　　处：《铸造》2010年第12期1345-1348,共4页Foundry

基　　金：北京科技大学新金属材料国家重点实验室开放基金资助项目(2008Z-2);湖南省教育厅资助科研项目(10C055)

摘　　要：在稀土镁合金专用熔剂覆盖和氩气保护下制备了Mg-7Gd-3Y、Mg-7Gd-3Y-0.3Zr、Mg-7Gd-3Y-0.5Zr、Mg-7Gd-3Y-0.7Zr四种合金。采用光学显微镜、X射线衍射、室温力学测试对合金的显微组织与力学性能进行了分析,研究了Zr元素对合金晶粒大小及铸态力学性能的影响。显微组织观察表明,Zr显著地细化Mg-7Gd-3Y合金的晶粒。力学性能测试表明,Zr元素的添加,使合金铸态下的抗拉强度和伸长率均得到了较大提高。The Mg-7Gd-3Y,Mg-7Gd-3Y-0.3Zr,Mg-7Gd-3Y-0.5Zr and Mg-7Gd-3Y-0.7Zr magnesium alloys were prepared under the combined protection of the special flux and argon.The microstructure and mechanical properties of the alloys were investigated through optical microscopy,X-ray diffraction analysis and tensile test.The effects of Zr on the grain size and room temperature tensile properties of the as-cast alloy were investigated.It is found that the Zr addition can obviously refine the grain size.The tensile tests of the alloys at room temperature show that the Zr addition can enhance the tensile strength and elongation of the as-cast alloy.

关 键 词：MG-GD-Y-ZR镁合金 ZR 显微组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]