Gd和Y对AM60镁合金高温力学性能的影响  

Effect of Gd and Y on High Temperature Mechanical Properties of AM60 Magnesium Alloy

作　　者：樊晓薇 杨俊杰[1] 李尧[1] 

机构地区：[1]江汉大学机电与建筑工程学院

出　　处：《特种铸造及有色合金》2015年第12期1329-1332,共4页Special Casting & Nonferrous Alloys

基　　金：武汉市科技计划项目(2013071004010467)

摘　　要：在AM60镁合金中添加不同含量的稀土元素Gd和Y,形成AM60-RE,并进行T4处理。通过高温拉伸力学试验测定合金的抗拉强度和伸长率。结合金相显微组织观察表明,土元素Y和Gd能够通过固溶强化作用减少AM60镁合金在高温拉伸时的软化,并且通过第二相强化减少Mg17Al12相数量以及在130℃时的软化、粗化,改变其形貌;同时Y、Gd与Mg、Al形成的高熔点化合物在130℃时能强化AM60镁合金基体。添加Y和Gd的RE-AM60镁合金在130℃下,铸态抗拉强度可达227 MPa,T4处理后达到236 MPa,与未添加稀土的AM60相比,铸态抗拉强度提高了12.4%,T4态抗拉强度提高了13.5%。Influences of rare-earth elements such as Y and Gd on the high temperature mechanical properties and microstructure of T4 treated AM60 magnesium alloy were investigated by tensile testing and OM（optical microscopy）and SEM（scanning electron microscopy）.The results show that rare-earth elements Y and Gd can restrian the AM60 alloy from softening through solid solution strengthening,and decrease the Mg17Al12 content as well as improving the softness and coarseness of the Mg17Al12 phase at130 ℃.The high melting new phases of Y,Gd with Al,Mg can enhance behavior alloy at 130 ℃.The tensile strength of the alloy with Y and Gd addition can reach 227 MPa and 236 MPa in as-cast and T4 treated conditions,increased by 12.4% and by 13.5%,respectively,compared with those of AM60 alloy with absence of RE addition.

关 键 词：稀土元素 AM60镁合金 高温力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG146.45[金属学及工艺—金属材料]