张帅,李全安,朱宏喜,陈晓亚,王颂博,关海昆

• 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、扫描电镜、X射线衍射仪、XHB-3000型布氏硬度计和万能电子拉伸实验机等研究了Mg-11Gd-3Y-0.8Ca-0.5Zr合金的最佳热处理工艺和热处理对合金显微组织及性能的影响。结果表明:合金的最佳固溶工艺为485℃×16 h+505℃×16 h,时效工艺为225℃×12 h。铸态合金主要由初生相α-Mg基体和大量处于晶界处网络状的Mg_5Gd、Mg_(24)Y_5、Mg_2Ca相组成。经固溶时效后,相种类没有变化,但晶界变得清晰,第二相的形貌显著改变,呈颗粒状和短棒状均匀分布在基体上,组织得到明显改善,合金的力学性能显著提高,时效态合金的抗拉强度、屈服强度及硬度均显著优于铸态合金,分别由原来的217 MPa、185 MPa和92 HB增加到265 MPa、228 MPa和121 HB,这主要归功于时效沉淀强化的作用。

关键词(KeyWords)： Mg-11Gd-3Y-0.8Ca-0.5Zr合金;固溶;时效;显微组织

Abstract:

Keywords:

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

作者(Author): 张帅,李全安,朱宏喜,陈晓亚,王颂博,关海昆

DOI: 10.13289/j.issn.1009-6264.2019-0317

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