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.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
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)
关键词
钇
钕
镁合金
力学性能
显微组织
Y
Nd
magnesium alloy
mechanical properties
microstructure
