固溶时效处理过程中Mg-Ce合金中稀土相的分布变化规律  

Distribution Variation of Rare Earth Phase in Mg-Ce Alloy During Solution and Aging Treatment

作　　者：陈燕飞 黄绍军 王玉香[1,2] 张金祥 CHEN Yanfei;HUANG Shaojun;WANG Yuxiang;ZHANG Jinxiang(Ganzhou Nonferrous Metallurgy Research Institute,Ganzhou 341000,China;Nation Rare-Earth Functional Materials Manufacturing Innovation Center,Ganzhou 341000,China;Jiangxi Jiangtungsten Rare Metal New Material Co.,Ltd.,Nanchang 330031,China)

机构地区：[1]赣州有色冶金研究所,赣州341000 [2]国家稀土功能材料创新中心,赣州341000 [3]江西江钨稀有金属新材料有限公司,南昌330031

出　　处：《机械工程材料》2022年第1期56-60,共5页Materials For Mechanical Engineering

基　　金：江西省自然科学基金面上项目(20202BABA204009);江西省重点研发计划项目(20203BBG73070)。

摘　　要：以纯镁和Mg-30Ce中间合金为原料铸造铈质量分数为1%的Mg-Ce合金,并进行420℃×8 h固溶和200℃×20 h时效处理,研究了不同状态时合金中稀土相分布的变化规律。结果表明:铸态、固溶态和时效态合金中的稀土相均为Mg_(12)Ce;铸态合金中的稀土析出相分布不均匀,以晶界处析出为主,晶粒内析出为辅,且析出相尺寸、形貌差异较大;固溶处理后,稀土相大多溶解于镁基体,但晶界处和部分晶粒内仍有一定量残余;时效处理后稀土相在晶粒内重新均匀、弥散析出,晶界处析出量较少,与铸态合金相比,析出相尺寸更加细小、分布更加均匀。With pure magnesium and Mg-30 Ce master alloy as raw materials,the Mg-Ce alloy with 1 wt%Ce was prepared by casting,and treated by solution at 420℃ for 8 h and aging at 200℃ for 20 h.The change of rare earth phase distribution in the alloy in different states was studied.The results show that the rare earth phases of the as-cast,solution-treated and aging-treated alloy were all Mg_(12)Ce.The distribution of rare earth precipitation phases in the as-cast alloy was uneven,which was dominated by boundary precipitation and supplemented by in-grain precipitation,and the size and morphology of the precipitation phase were quite different.After solution treatment,most of the precipitated rare earth phase was soluted in the magnesium matrix,but there were still a certain number of rare earth phases at grain boundaries and in part of grains.After the aging treatment,the rare earth phase uniformly dispersed in grains,and the amount of precipitation at grain boundaries was smaller.Compared with the as-cast sample,the precipitated phase after aging was smaller in size and distributed more uniformly.

关 键 词：铈元素 镁稀土合金 稀土相 固溶时效处理 

分 类 号：TG456[金属学及工艺—焊接]