摘要
在Mg-Zn-Zr系ZK60变形镁合金中分别添加0.9%稀土元素钇和铈,对合金进行了热挤压及时效处理,研究了稀土元素在ZK60合金中的存在形式和作用机理及其对合金组织与性能的影响。结果表明:添加的稀土元素钇和铈均能够明显细化ZK60铸态组织,改善合金的力学性能。稀土元素钇的强化作用尤为明显,合金的室温抗拉强度提高了12.6%;而稀土元素铈则提高了合金的伸长率。
Mg-Zn-Zr alloy ZK60 with addition of rare-earth elements Y and Ce was prepared with chemical composition（mass/%） of Mg-5. 5Zn-0. 7Zr-0. 9Y and Mg-5. 5Zn-0. 7Zr-0. 9Ce. Through hot extruding and aging treatment, the existing form and affecting mechanisms of Y and Ce in alloys and the effects on the microstructure and mechanical properties were studied. The rare-earth elements Y and Ce both hade visible grain-refining effects on the alloys. Also, the rare-earth element Y and Ce improved the mechanical properties of the ZK60 alloy. The strengthening effect of Y was stronger than of Ce. σ of the Mg-Zn-Zr-Y alloy was 12. 6% higher than that of Mg- Zn-Zr alloy without Y. The rare-earth element Ce increased the elongation of the ZK60.
出处
《机械工程材料》
CAS
CSCD
北大核心
2005年第12期17-20,25,共5页
Materials For Mechanical Engineering
基金
湖南省科技攻关项目(04GK1008-2)
关键词
ZK60合金
稀土元素
显微组织
力学性能
ZK60 alloy
rare-earth elements
microstructure
mechanical property
