金属热处理 ›› 2020, Vol. 45 ›› Issue (3): 166-168.DOI: 10.13251/j.issn.0254-6051.2020.03.032

• 工艺研究 • 上一篇    下一篇

双级固溶处理对7075高强铝合金组织和性能的影响

王基月1, 徐莉萍2   

  1. 1. 郑州科技学院 机械工程学院, 河南 郑州 450064;
    2. 河南科技大学 机电工程学院, 河南 洛阳 471003
  • 收稿日期:2019-09-21 出版日期:2020-03-25 发布日期:2020-04-03
  • 作者简介:王基月(1982—),男,副教授,工程师,硕士,主要研究方向为有色合金材料,E-mail:wangjiyue003@126.com。
  • 基金资助:

    河南省教育厅高等学校重点科研项目(18B460019)

Effect of two-stage solution treatment on microstructure and properties of 7075 high strength aluminum alloy

Wang Jiyue1, Xu Liping2   

  1. 1. College of Mechanical Engineering, Zhengzhou University of Science & Technology, Zhengzhou Henan 450064, China;
    2. School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang Henan 471003, China
  • Received:2019-09-21 Online:2020-03-25 Published:2020-04-03

摘要:

采用光学显微镜、电子万能试验机、维氏硬度计等对比研究了单级固溶处理与双级固溶处理对7075铝合金显微组织和力学性能的影响。结果表明:相对单级固溶处理,双级固溶处理7075铝合金中第二相粒子可以更为充分的溶入基体,固溶度更高。7075铝合金经460 ℃×1 h+480 ℃×0.5 h双级固溶处理后,组织中第二相粒子体积分数为0.303%,晶粒均匀细小,固溶效果理想。经460 ℃×1 h+480 ℃×0.5 h+120 ℃×24 h固溶时效处理后,7075铝合金硬度、抗拉强度和伸长率分别达到199 HV5、637 MPa和14.1%,综合性能最佳。

关键词: 7075铝合金, 双级固溶处理, 显微组织, 拉伸性能, 硬度

Abstract:

Effects of single-stage and two-stage solution treatment on microstructure and mechanical properties of 7075 aluminum alloy were studied by means of optical microscope, electronic universal testing machine and vickers hardness tester. The results show that the second phase particles of 7075 aluminum alloy treated with two-stage solution are much more dissolved into the matrix and have higher solid solubility than those treated with single-stage solution. After 460 ℃×1 h+480 ℃×0.5 h double-stage solution treatment, the volume fraction of the second phase in 7075 aluminum alloy is 0.303%, the grains are uniform and fine, and the solution effect is ideal. The hardness, tensile strength and elongation of 7075 aluminum alloy reach 199 HV5, 637 MPa and 14.1% respectively after 460 ℃×1 h+480 ℃×0.5 h+120 ℃×24 h solution and aging treatment, and the comprehensive properties are the best.

Key words: 7075 aluminum alloy, two-stage solution treatment, microstructure, tensile properties, hardness

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