Zn/Mg比对7075铝合金显微组织、力学性能和耐蚀性能的影响

doi:10.13251/j.issn.0254-6051.2024.05.001

金属热处理 ›› 2024, Vol. 49 ›› Issue (5): 1-9.DOI: 10.13251/j.issn.0254-6051.2024.05.001

• 材料研究 • 下一篇

Zn/Mg比对7075铝合金显微组织、力学性能和耐蚀性能的影响

何宗政, 吴名冬, 袁硕, 姚树伟, 肖代红, 黄兰萍, 刘文胜

中南大学粉末冶金研究院, 湖南长沙 410083

收稿日期:2023-11-17 修回日期:2024-03-26 出版日期:2024-05-25 发布日期:2024-06-28
通讯作者: 肖代红,教授,博士,E-mail:daihongx@csu.edu.cn
作者简介:何宗政(2000—),男,硕士研究生,主要研究方向为铝合金,E-mail:947652409@qq.com。
基金资助:
预研基金项目(412130024)

Effect of Zn/Mg ratio on microstructure, mechanical properties and corrosion resistance of 7075 aluminum alloy

He Zongzheng, Wu Mingdong, Yuan Shuo, Yao Shuwei, Xiao Daihong, Huang Lanping, Liu Wensheng

Powder Metallurgy Research Institute, Central South University, Changsha Hunan 410083, China

Received:2023-11-17 Revised:2024-03-26 Online:2024-05-25 Published:2024-06-28

摘要/Abstract

摘要： 通过光学显微镜、扫描电镜、透射电镜、拉伸试验、硬度测试及腐蚀测试等方法,研究了不同Zn/Mg比(质量分数)对7075铝合金组织、力学性能和耐蚀性能的影响。结果表明,随着Zn/Mg比由1.76增加到2.90,铸态铝合金晶粒尺寸增大,铝合金的T6时效硬化速率加快,达到峰值硬度的时间缩短。Zn/Mg比的增加导致T6峰时效态铝合金的再结晶率降低和低角度晶界占比增加。Zn/Mg比为2.10时,T6峰时效处理下铝合金的抗拉强度为634 MPa,屈服强度为588 MPa,伸长率为8.4%;T74时效态的抗拉强度为613 MPa,屈服强度为542 MPa,伸长率为8.9%。两种时效状态下的铝合金(Zn/Mg比为2.10)均在拥有良好强度的同时保持着较高的伸长率。随着Zn/Mg比由1.76增加到2.90,时效态铝合金的耐蚀性能降低。且T74时效处理后铝合金的耐蚀性能优于T6峰时效态下的铝合金。

关键词: Al-Zn-Mg-Cu合金, Zn/Mg比, 微观结构, 力学性能, 耐蚀性能

Abstract: Effect of Zn/Mg ratio (mass fraction) on microstructure, mechanical properties, and corrosion resistance of 7075 aluminum alloys was investigated by means of optical microscope, scanning electron microscope, transmission electron microscope, tensile test, microhardness test and corrosion test. The results show that with the increase of Zn/Mg ratio from 1.76 to 2.90, the grain size of the as-cast alloy increases, the T6 age-hardening rate of the alloy is accelerated, and the time to reach peak hardness is shortened. The increase in Zn/Mg ratio results in a decrease in the recrystallization rate of the T6 peak-aged alloy and an increase in the percentage of the low-angle grain boundaries. The tensile strength of the alloy under the T6 peak-aging treatment with the Zn/Mg ratio of 2.10 is 634 MPa, the yield strength of the alloy is 588 MPa, and elongation is 8.4%. The tensile strength of the T74 aged alloy is 613 MPa, yield strength is 542 MPa, and elongation is 8.9%, and alloys with Zn/Mg ratio of 2.10 in both aging states exhibit good strength while maintaining high elongation. The corrosion resistance of the aged alloy decreases as the Zn/Mg ratio increases from 1.76 to 2.90. The corrosion resistance of the alloy after T74 aging treatment is better than that of the alloy under the T6 peak-aging state.

Key words: Al-Zn-Mg-Cu alloy, Zn/Mg ratio, microstructure, mechanical properties, corrosion resistance

中图分类号:

TG146.2

何宗政, 吴名冬, 袁硕, 姚树伟, 肖代红, 黄兰萍, 刘文胜. Zn/Mg比对7075铝合金显微组织、力学性能和耐蚀性能的影响[J]. 金属热处理, 2024, 49(5): 1-9.

He Zongzheng, Wu Mingdong, Yuan Shuo, Yao Shuwei, Xiao Daihong, Huang Lanping, Liu Wensheng. Effect of Zn/Mg ratio on microstructure, mechanical properties and corrosion resistance of 7075 aluminum alloy[J]. Heat Treatment of Metals, 2024, 49(5): 1-9.

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Zn/Mg比对7075铝合金显微组织、力学性能和耐蚀性能的影响

Effect of Zn/Mg ratio on microstructure, mechanical properties and corrosion resistance of 7075 aluminum alloy

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