金属热处理 ›› 2020, Vol. 45 ›› Issue (8): 185-188.DOI: 10.13251/j.issn.0254-6051.2020.08.036

• 工艺研究 • 上一篇    下一篇

固溶处理对Al-Zn-Mg-Cu系超强铝合金组织与硬度的影响

黎志勇1, 史庆南2   

  1. 1.广东理工学院 工业自动化系, 广东 肇庆 526100;
    2.昆明理工大学 材料科学与工程学院, 云南 昆明 650093
  • 收稿日期:2020-01-26 出版日期:2020-08-25 发布日期:2020-09-07
  • 作者简介:黎志勇(1979—),男,副教授,硕士,主要研究方向为材料成形和金属3D打印技术,E-mail:gdfook@163.com
  • 基金资助:
    广东省自然科学基金(2016A030313004);广东理工学院重点科技项目(2019GKJZD003)

Effect of solution treatment on microstructure and hardness of Al-Zn-Mg-Cu super-strength aluminum alloy

Li Zhiyong1, Shi Qingnan2   

  1. 1. Department of Industrial Automation, Guangdong Institute of Technology, Zhaoqing Guangdong 526100, China;
    2. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming Yunnan 650093, China
  • Received:2020-01-26 Online:2020-08-25 Published:2020-09-07

摘要: 利用光学显微镜(OM)、扫描电镜(SEM)及维氏硬度计等研究了不同固溶处理参数对Al-Zn-Mg-Cu系超强铝合金7050固溶态组织与固溶时效态硬度的影响。结果表明:锻态7050铝合金组织中含有粗大块状初生相和针状、点状的η(MgZn2)相。随着固溶温度的升高和固溶时间的增加,合金组织中的未溶相减少,再结晶组织体积分数增高。经过470 ℃×4 h固溶+120 ℃×24 h时效处理7050铝合金的硬度值达到最大,为189 HV0.2。

关键词: Al-Zn-Mg-Cu合金, 固溶处理, 组织, 硬度

Abstract: Effects of different solid solution treatments on the microstructure after solution and the hardness after solution and aging of Al-Zn-Mg-Cu super-strength aluminum alloy 7050 were studied by means of optical microscopy (OM), scanning electron microscopy (SEM) and Vickers hardness tester. The results show that there is coarse bulk primary phase, needle-like and point-like η(MgZn2) phase in the microstructure of as-forged 7050 aluminum alloy. With the increase of solution temperature and solution time, the undissolved phase in the alloy decreases, and the volume fraction of recrystallized microstructure increases. The hardness of the 7050 aluminium alloy solution treated at 470 ℃ for 4 h and then aged at 120 ℃ for 24 h reaches the maximum value of 189 HV0.2.

Key words: Al-Zn-Mg-Cu alloy, solution treatment, microstructure, hardness

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