金属热处理 ›› 2020, Vol. 45 ›› Issue (8): 170-172.DOI: 10.13251/j.issn.0254-6051.2020.08.033

• 工艺研究 • 上一篇    下一篇

固溶时效处理对7005铝合金冲击性能的影响

张建宇, 王征, 王进录, 柯伟, 陆起高   

  1. 云南云铝泽鑫铝业有限公司, 云南 曲靖 655500
  • 收稿日期:2020-02-05 出版日期:2020-08-25 发布日期:2020-09-07
  • 作者简介:张建宇(1972—),男,正高级工程师,主要研究方向为有色金属材料,E-mail:zxzljsk@163.com
  • 基金资助:
    云南省重大科技专项计划(2018ZE005-01)

Effect of solution and aging treatment on impact properties of 7005 aluminum alloy

Zhang Jianyu, Wang Zheng, Wang Jinlu, Ke Wei, Lu Qigao   

  1. Yunnan Aluminium Zexin Co. , Ltd. , Qujing Yunnan 655500, China
  • Received:2020-02-05 Online:2020-08-25 Published:2020-09-07

摘要: 采用光学显微镜、SEM和冲击试验机研究了固溶时效处理后的7005铝合金的冲击性能。结果表明,7005铝合金铸态组织中晶界比较宽大,并且在晶内存在大量的非平衡析出相,经固溶时效处理后晶粒内的颗粒析出相的数量大量减少。铸态合金晶界上析出相含有较多的Zn、Mg、Mn元素,固溶时效后在合金晶粒内部存在的析出相主要为η(MgZn2)平衡相,在晶界上仍然残留有部分AlZnMg(Mn)析出相,该析出相具有较好的热稳定性,无法完全回溶。固溶时效后,合金晶粒内的颗粒状析出相大部分溶入基体,使固溶度增加而使合金强度增高,改善了7005铝合金的冲击性能。

关键词: 7005铝合金, 固溶时效, 析出相, 冲击性能

Abstract: Impact properties of the 7005 aluminum alloy after solution and aging treatment was studied by means of OM, SEM and impact test machine. The results show that coarse grain boundaries are observed in the as-cast 7005 aluminum alloy, and there are a large number of non-equilibrium precipitated phases in the grain, while after solution and aging treatment, the number of precipitated phases in the grain decreases greatly. The precipitate phases on the as-cast alloy grain boundary contain more Zn, Mg and Mn elements. After solution and aging treatment the precipitated phases existed in grain are η (MgZn2) equilibrium phase mainly, and there are still some residual precipitated phases AlZnMg(Mn) on grain boundary because of the good thermal stability, which leads to dissolution incomplete. After solution and aging treatment, the solid solubility increases because most precipitated phase particles in the grain dissolve into the matrix, which causes the strength of the alloy to increase and improves the impact properties of the 7005 aluminum alloy.

Key words: 7005 aluminum alloy, solution and aging treatment, precipitated phase, impact properties

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