金属热处理 ›› 2025, Vol. 50 ›› Issue (7): 277-280.DOI: 10.13251/j.issn.0254-6051.2025.07.040

• 工艺研究 • 上一篇    下一篇

时效前预拉伸对7075铝合金组织与冲击性能的影响

谭国寅   

  1. 昆明冶金研究院有限公司, 云南 昆明 650031
  • 收稿日期:2025-02-10 修回日期:2025-05-15 出版日期:2025-07-25 发布日期:2025-07-28
  • 作者简介:谭国寅(1986—),男,高级工程师,硕士,主要研究方向为有色金属加工,E-mail:80982250@163.com
  • 基金资助:
    云南省重大科技专项计划(202302AB080024)

Pre-stretching before aging on microstructure and impact property of 7075 aluminum alloy

Tan Guoyin   

  1. Kunming Metallurgical Research Institute Co., Ltd., Kunming Yunnan 650031, China
  • Received:2025-02-10 Revised:2025-05-15 Online:2025-07-25 Published:2025-07-28

摘要: 采用OM、SEM和冲击试验机研究了时效前预拉伸对固溶时效7075铝合金组织与冲击性能的影响。结果表明:与固溶-时效处理相比,时效前进行预拉伸可以改善7075铝合金的显微组织,显著改变析出相粒子的分布与尺寸大小。预拉伸增加了组织中的位错密度,为析出相粒子的析出提供了更好的组织条件和扩散通道,促进了Cu的伴随析出。同时,预拉伸使合金内积累了一定的畸变能,从而降低了合金元素扩散所需要的激活能,使得析出相粒子长大更为充分。时效前预拉伸改善了7075铝合金显微组织的各向异性,促进微米级析出相粒子弥散均匀析出,极大地提高了冲击性能。

关键词: 预拉伸, 固溶时效处理, 冲击性能, 析出相粒子

Abstract: Effect of pre-stretching before aging on microstructure and impact property of 7075 aluminum alloy was studied by means of OM, SEM and impact testing machine. The results indicate that compared with solution-aging treatment, pre-stretching before aging can improve the microstructure of the 7075 aluminum alloy and significantly alter the distribution and size of precipitated phase particles. Pre-stretching increases the dislocation density within the alloy, providing a better microstructure conditions and diffusion channel for the precipitated phase particles, which promotes the accompanying precipitation of Cu. At the same time, pre-stretching accumulates a certain amount of distortion energy within the alloy, thereby reducing the activation energy required for diffusion and allowing the precipitated phase particles to grow more fully. Pre-stretching before aging improves the anisotropy of the microstructure of the alloy, which promotes the micron sized particles precipitated dispersedly and uniformly, and greatly enhances the impact property of the 7075 aluminum alloy.

Key words: pre-stretching, solution and aging treatment, impact property, precipitated phase particles

中图分类号: