钕对二元高铝镁合金组织及性能的影响.pdfVIP

学兔兔 Jan．2010 · 60 · VOI．59 NO．1 钕对二元高铝镁合金组织及性能的影响 阴耀鹏，梁 伟，王红霞，赵兴国，龚家林 (太原理工大学材料科学与工程学院，山西太原030024) 摘要：研究了稀土元素钕对Mg．15A1合金显微组织和力学性能的影响。试验结果表明：加入钕后，Mg 15A1合金的 d．Mg晶粒明显细化，e,+13共晶组织由粗大网状变得分散、细小，钕与铝结合形成稳定的Al。 Nd3，合金的抗拉强度和伸 长率均得到显著提高。钕加入量为1．O％时，组织细化效果最好，Mg一15A1合金的综合力学性能达到最佳。当钕加入量 为1．5％时， —Mg晶粒又变大、抗拉强度略有下降。 关键词：稀土元素；镁铝二元合金；晶粒细化；力学性能 中图分类号：TG146．2+2 文献标识码：A 文章编号：1001—4977(2010)01—0060—04 Effects of Nd on Microstructure and Mechanical Properties of High-Aluminum Magnesium Alloy YIN Yao—peng，LIANG Wei，WANG Hong—xia，ZHAO Xing-guo，GONG Jia-lin (College of Materials Science and Engineering，Taiyuan University of Technology Taiyuan 030024，Shanxi，China) Abstract：0M。SEM，XRD and tensile testing were employed to investigate the Nd’S effects on microstructures and mechanical properties of Mg-1 5AI alloy．The experimental results show that a．Mg size iS refined and the morphology of oc+B eutectic structure in the as—cast Mg一1 5AI alloy changes frOm massive network to smalI and discontinuous one with adding small amounts of Nd which reacts with AI to form a stable new phase AI11Nd3，and both the tensile strength and elongation of the Mg,1 5Al alloy are improved remarkably．The grain refinement and the mechanical properties are optimized at the content of 1％ Nd．With the further addition of Nd up tO 1．5％，the a—Mg grains become coarse and the tensile strength decreases． Key words：rare—earth element；Mg-AI binary alloy；grain refinement；mechanicaI properties 镁合金具有密度小、比强度和比刚度高、导热导