戚尧,李全安,陈晓亚,史浩鹏

• 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

摘要(Abstract)：

采用光学显微镜、扫描电镜、X射线衍射仪、电子拉伸实验机、布氏硬度计等研究了铸态Mg-5Y-3Sm-xHo-0.5Zr(x=0, 2, 4, 6)合金的组织和力学性能。结果表明:铸态Mg-5Y-3Sm-0.5Zr合金主要由α-Mg和大部分位于晶界的Mg_(24)Y_5和Mg_(41)Sm_5第二相组成。添加Ho后,在晶界处出现了Mg_(24)Ho_5新相,Ho的含量高低对合金相组成没有影响。随着Ho含量的不断提高,析出的第二相逐渐增多,晶粒尺寸逐渐减小。当Ho含量为4%时,该铸态合金的综合力学性能最好,抗拉强度、屈服强度、硬度和伸长率分别为193 MPa、170 MPa、72.8 HBW和4.15%。

关键词(KeyWords)： Mg-Y-Sm-Zr合金;Ho;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): 戚尧,李全安,陈晓亚,史浩鹏

DOI: 10.13289/j.issn.1009-6264.2019-0406

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