Mg-xGd-Zr合金均匀化过程研究  

Homogenization of Mg-xGd-Zr alloys

作　　者：陈丽芳 袁家伟[2] 张奎[2] 赵旭[2] 

机构地区：[1]西南铝业(集团)有限责任公司,重庆401326 [2]北京有色金属研究总院,北京100088

出　　处：《铝加工》2015年第6期36-43,共8页Aluminium Fabrication

摘　　要：实验采用光学金相、扫描电镜和布氏硬度测试等方法,研究了Mg-xGd-Zr（x=1%、2%、3%）合金不同均匀化制度下的组织形貌变化,并对合金中方块相的形成进行了分析。结果表明,随着Gd含量的升高,合金中共晶组织增加晶粒尺寸减小,3种合金合适的热处理工艺,分别为793K×6h、793K×8h和793K×12h。在均匀化过程中随着时间的延长共晶组织发生分解,但方块相依旧存在,且其数量与合金中Gd含量呈正比,同时Gd含量从铸态的41.5%~56.2%升高至均匀化态的72.5%~88.5%。The microstructures evolution of Mg-xGd-Zr（x=1,2,3at%） alloys during homogenization at different temperatures were investigated by means of optical microscope（OM）, scanning electron microscope（SEM） and Brinell hardness test, and the formation of the cuboid-shaped phase in alloys was analyzed. The results show that the grain size decreases with the increasing Gd content in alloys and the optimized homogenization for 1-3# alloys are 793K×6h, 793K×8h and 793K×12h, respectively. The eutectic structure has been decomposed but cuboid-shaped phase hasn＇t decomposed during homogenization and its number is proportional to the Gd content in alloys. Moreover, the Gd content in the cuboid-shaped phase increases from 41.5-56.2at% to 72.5-88.5 at% after homogenization.

关 键 词：镁合金 均匀化 第二相 

分 类 号：TG146.22[一般工业技术—材料科学与工程]