稀土元素Er对Al-5Mg合金铸态组织的影响  

Effects of Rare Earth Er on As-Cast Microstructure of Al-Mg Alloy

作　　者：季小兰[1] 聂祚仁[1] 邢泽炳[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100022

出　　处：《轻合金加工技术》2005年第10期19-21,28,共4页Light Alloy Fabrication Technology

基　　金：国家"973"重大基础规划研究项目资助课题(G1999064907)

摘　　要：采用铸锭冶金法制备了含不同量稀土元素Er的Al-5Mg合金。发现稀土Er可以有效细化Al-Mg铸态晶粒,当Er含量达0.7%时,基本上消除枝晶,且晶粒大小仅为不加Er Al-5Mg合金的1/10。使用硬度测试、金相组织观察、SEM及热分析等方法,研究了稀土元素Er对Al-5Mg合金铸态组织的细化与强化机理。Al-5Mg alloys with different content of Er addition were prepared by using ingot metallurgy processing. It is found that rare earth Er is effective in refining grain size of as-cast microstructure.When alloy contains 0.7% Er,dendritic structure is almost eliminated, and the grain size is as 7 times large as that in Al-5Mg alloy. With hardness measure, optical microscope, scanning electron microscope and thermo analysis, this paper study the mechanism that rare earth Er refine grain size and improve the strength of as-cast structure

关 键 词：Al-5Mg合金 铸态组织 稀土元素ER 强化 细化 

分 类 号：TG27[金属学及工艺—铸造]