Mg-5Sn-xGd合金的铸态显微组织  

As-cast Microstructure of Mg-5Sn-xGd Alloys

作　　者：牛高[1] 陈云贵[1] 唐永柏[1] 肖素芬[1] 章晓萍[1] 魏尚海[1] 赵源华[1] 

机构地区：[1]四川大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2008年第2期150-152,共3页Special Casting & Nonferrous Alloys

基　　金：四川省科技厅重点攻关项目(04GG1589)

摘　　要：研究了Mg-5Sn-xGd(x=0,0.5,1.0,2.0,4.0,6.0)合金的铸态显微组织。试验表明,随着Gd含量的增加,合金晶界上连续分布的片层状α-Mg+Mg2Sn共晶组织逐渐减少并变得不连续。当Gd含量达到4%时,合金中共晶组织基本消失。在共晶组织减少的同时,合金晶界附近同时生成一种细小的不规则形状的Mg-Sn-Gd三元稀土相,随Gd含量的增加,该稀土相的数量增加,DSC分析结果显示该稀土相在582℃时可能发生相变。Gd的加入对合金中Sn元素的分布有显著影响。The as-cast microstructures of Mg-5Sn-xGd(x=0,0.5,1.0,4.0,6.0) alloys have been observed.The experimental results indicate that with increasing in Gd content,the lamellar α-Mg+Mg2Sn eutectic phase which is mainly distributed continuously in the grain boundary areas of the alloy is reduced and becomes discontinuous.With 4% Gd addition,the eutectic phase in the alloy can be hardly found.In addition,a new fine Mg-Sn-Gd phase with irregular shape is generated in near grain boundary of the alloy with the decrease of eutectic phase,increased with increasing in Gd content.The DSC analysis indicate that the rare-earth phase has a phase transition at 582 ℃.The addition of Gd has an obvious effect on the distribution of the element Sn in the alloy.

关 键 词：Mg-Sn-Gd合金 铸态显微组织 稀土相 

分 类 号：TG136.1[一般工业技术—材料科学与工程]