李志涛,李全安,陈晓亚

• 1:河南科技大学材料科学与工程学院
• 2:有色金属共性技术河南省协同创新中心
• 3:西安理工大学材料科学与工程学院

摘要(Abstract)：

采用光学显微镜、X射线衍射仪、扫描电镜对时效态Mg-4Y-2Sm-xGd-0.5Zr(x=0, 0.5, 1, 1.5 mass%)合金进行了微观组织及物相分析,并采用拉伸实验机在室温至250℃下对其进行了力学性能测试。结果表明:时效态Mg-4Y-2Sm-0.5Zr合金组织主要由α-Mg基体与Mg_(24)Y_5和Mg_(41)Sm_5析出相组成;加入Gd元素后,合金组织中有新相Mg_5Gd形成;随着Gd添加量的增加,Mg_5Gd析出相的数量增加,合金的晶粒得到细化;同一温度拉伸时,合金的抗拉强度在Gd添加量为1.0 mass%时达到峰值,其中室温拉伸时含1.0 mass%Gd的合金的抗拉强度为223.6 MPa;同一成分合金的抗拉强度随着拉伸温度的升高呈逐渐降低的趋势;室温拉伸时合金的伸长率在Gd添加量为0.5 mass%时最高,为15.13%;在150～250℃时高温拉伸时,伸长率在Gd添加量为1.0 mass%时达到峰值,并且比较稳定;加入Gd元素后的合金在150～250℃时具有良好的耐高温性能和热稳定性。

关键词(KeyWords)： Mg-4Y-2Sm-xGd-0.5Zr合金;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51571084,51171059)

作者(Author): 李志涛,李全安,陈晓亚

DOI: 10.13289/j.issn.1009-6264.2019-0254

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