La对高铝锌合金组织和性能的影响  

Effect of La on Microstructure and Properties of High-Aluminium Zinc Cast Alloys

作　　者：杨涤心[1] 高存贞[1,2] 谢敬佩[1] 王爱琴[1] 王文炎[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003 [2]河南省有色金属材料科学与加工技术重点实验室,河南洛阳471000

出　　处：《铸造》2010年第12期1341-1344,共4页Foundry

基　　金：河南省国际合作项目(084300510006);河南科技大学博士科研基金(2008bs025)

摘　　要：在高铝锌合金中加入不同量的稀土La浇注合金试样,通过微观金相组织分析和力学性能分析,研究了微量稀土元素La对进一步改善锌铝合金组织、提高性能及作用机理。试验结果表明:La加入量在0.1%时,能够细化锌铝铸造合金的组织,改善高铝锌合金的力学性能,合金的拉伸强度、伸长率和硬度都有一定的提高;La的加入量过多时,La以块状的富La稀土相析出;La加入量在0.4%左右时,能够显著消除合金的底缩。In this research,Zn-Al alloy samples adding different amounts of La were cast,and microstructure and mechanical property analysis were carried out to study the effect of trace La on microstructure and performance of ZA303 alloy as well as the action mechanism.Experimental results show that adding 0.1% La can refine the structure and improve the mechanical properties of high aluminium zinc alloy,thus its tensile strength,elongation and hardness were enhanced.When excess La is added,La precipitates as blocky rich-La phase;addition of 0.4% La can significantly eliminate the shrinkage at the bottom of the alloy.

关 键 词：高铝锌合金 稀土元素 LA 

分 类 号：TG292[金属学及工艺—铸造]