金属热处理 ›› 2021, Vol. 46 ›› Issue (3): 80-85.DOI: 10.13251/j.issn.0254-6051.2021.03.016

• 工艺研究 • 上一篇    下一篇

固溶工艺对挤压态Mg-9.2Gd-1.9Y-1.8Zn-0.5Zr合金组织和硬度的影响

吴晓宝, 张星, 张晋禄   

  1. 中北大学 材料科学与工程学院, 山西 太原 030051
  • 收稿日期:2020-09-27 出版日期:2021-03-25 发布日期:2021-05-08
  • 通讯作者: 张星,教授,博士,E-mail:xiaobao_0501@qq.com
  • 作者简介:吴晓宝(1993—),男,硕士研究生,主要研究方向为精密塑性成型与改性技术,E-mail:2531137296@qq.com。

Effect of solution treatment process on microstructure and hardness of as-extruded Mg-9.2Gd-1.9Y-1.8Zn-0.5Zr alloy

Wu Xiaobao, Zhang Xing, Zhang Jinlu   

  1. School of Materials Science and Engineering, North University of China, Taiyuan Shanxi 030051, China
  • Received:2020-09-27 Online:2021-03-25 Published:2021-05-08

摘要: 通过差热分析(DSC)、光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)等分析手段研究了不同固溶处理工艺对挤压态Mg-9.2Gd-1.9Y-1.8Zn-0.5Zr合金微观组织和力学性能的影响。结果表明:挤压态Mg-9.2Gd-1.9Y-1.8Zn-0.5Zr合金经过固溶处理后显微组织主要由α-Mg基体、Mg12Zn(Gd, Y)相、富稀土相等组成。当固溶温度达到490 ℃后,随着保温时间的延长,合金基体中析出规则条纹状14H-LPSO相,该相主要起到第二相强化的作用,并能显著提高试验材料的显微硬度。该合金的最佳固溶处理工艺为490 ℃×13 h时,其平均显微硬度最高,达到77 HV0.2。

关键词: Mg-9.2Gd-1.9Y-1.8Zn-0.5Zr合金, 固溶处理, 显微组织, 硬度

Abstract: Effects of different solution treatment processes on microstructure and mechanical properties of as-extruded Mg-9.2Gd-1.9Y-1.8Zn-0.5Zr alloy were studied by means of DSC, OM, SEM, and TEM. The results show that, after solid solution treatment the microstructure of the alloy consists of α-Mg matrix, Mg12Zn(Gd,Y) phase and phases rich in rare earth. With the increase of holding time, the regular striated LPSO phase is precipitated in the matrix when the tested alloy solution treated at 490 ℃, which plays an important role in second phase strengthening and remarkably improves the microhardness of the tested material. The optimum solution treatment process of the alloy is 490 ℃×13 h, at which the highest average microhardness of the tested alloy can reach 77 HV0.2.

Key words: Mg-9.2Gd-1.9Y-1.8Zn-0.5Zr alloy, solution treatment, microstructure, hardness

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