钇钕复合合金化对Mg-6Al合金力学性能的影响  

Effects of Y and Nd combined addition on mechanical properties of Mg-6Al alloy

作　　者：李建弘[1] 李全安[1] 谢建昌[1] 张兴渊[1] 李克杰[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

出　　处：《材料热处理学报》2008年第4期79-82,共4页Transactions of Materials and Heat Treatment

基　　金：河南省杰出人才计划(084200510018);河南省高校创新人才培养基金(豫高教[2002]129);洛阳市科技攻关项目(0602018A);河南科技大学重大预研项目(2007ZD002)

摘　　要：研究了Y、Nd复合合金化（Y∶Nd=2∶1,wt%）对Mg-6Al合金显微组织和力学性能的影响。结果表明,添加稀土元素Y和Nd可显著提高合金从室温至175℃区间的屈服强度和抗拉强度。在Mg-6Al合金中加入总含量为0.9wt%～3.6wt%的Y＋Nd后,合金的晶粒得到明显细化,且出现Al2Y、Al2Nd高熔点稀土合金相。并探讨了钇钕复合合金化对提高镁铝基合金力学性能的机理：室温下主要是细晶强化机制;高温下则主要是高熔点稀土合金相（Al2Y、Al2Nd）的弥散强化,并由此使热稳定性差的-βMg17Al12相的数量减少。Effects of Y and Nd combined addition （Y： Nd = 2： 1, wt% ） on microstructure and mechanical properties of Mg-6Al alloy were investigated. The results show that the combined addition of Y and Nd dramatically enhances the yield strength and tensile strength of the alloys in the temperature range of 20 ～ 175℃ . The crystallite size is remarkably refined, and the phases of Al2 Y and Al2Nd with high melting point are observed in the Mg-6Al alloy with 0.9 wt% ～ 3.6wt% Y ＋ Nd. Fine-grain strengthening is responsible for the increase of strength at room temperature and the dispersion strengthening of the high-mehing point phases of Al2Y and Al2Nd is main strengthening mechanism at elevated temperature for the Mg-6Al alloy with less amount of Mg17 Al12 phase.

关 键 词：钇 钕 镁合金 力学性能 显微组织 

分 类 号：TG146.2[一般工业技术—材料科学与工程]