固溶温度对Mg-10Gd-3Y-1.2Zn-0.5Zr合金的组织演变规律和时效硬化行为的影响  

Effects of Solution Temperature on Microstructure Evolution and Aging Hardness of Mg-10Gd-3Y-1.2Zn-0.5Zr Alloy

作　　者：黄太红[1] 宋鹏[1] 周会会[1] 陆建生[1] 

机构地区：[1]昆明理工大学,云南昆明650093

出　　处：《稀有金属材料与工程》2016年第2期431-435,共5页Rare Metal Materials and Engineering

基　　金：云南省应用基础研究面上项目(2013FB016);教育部留学回国人员科研启动基金资助项目(教外司(2013)1792号);高等学校博士学科点专项科研基金资助课题(20125314110002;20135314120003)

摘　　要：利用OM、XRD、SEM和TEM研究了Mg-10Gd-3Y-1.2Zn-0.5Zr(质量分数,%)铸态合金的显微组织和不同温度下固溶热处理后的组织演变规律。结果表明:Zn含量为1.2%的合金在等温固溶条件下,随时间的延长,晶界处LPSO层状生长,同时层状相向晶内延伸,层状相的层片变粗。随温度的升高铸态组织中原有的层状相溶解,而沿晶界化合物则向晶内有更宽的层状相生成,并随着温度的提高而变宽。此合金经不同温度的固溶后时效硬度最高可达1150MPa。The microstructures of cast Mg-10Gd-3Y-1.2Zn-0.5Zr alloy and the microstructure evolution of the alloy with solution heat treatment at different temperatures were studied by optical microscope, XRD, SEM and TEM. The results show that the LPSO lamellar phase grows with prolonging the time under the conditions of isothermal solution, when the Zn content is 1.2%. At the same time, the lamellar phase extends into grains which induce the lamellar to become wide. The original cast lamellar phase dissolves with the temperature increasing; however, a wider lamellar phase appears along compound located at the grain boundary. The new lamellar phase width increases with the temperature increasing. The hardness of the alloy could reach 1150 MPa after solution treatment at 525 ℃.

关 键 词：固溶温度 镁合金 长周期有序相 时效硬化 

分 类 号：TG146.22[一般工业技术—材料科学与工程]