预时效温度对AA7075铝合金烘烤硬化响应的影响

doi:10.13251/j.issn.0254-6051.2024.12.015

金属热处理 ›› 2024, Vol. 49 ›› Issue (12): 90-93.DOI: 10.13251/j.issn.0254-6051.2024.12.015

预时效温度对AA7075铝合金烘烤硬化响应的影响

张凯杰^1,2, 姜壹夫^1,2, 施金汭^1,2, 杨峰^1,2

1.沈阳工程学院机械学院, 辽宁沈阳 110136;
2.辽宁省能源电力装备可靠性与健康管理重点实验室, 辽宁沈阳 110136

收稿日期:2024-06-13 修回日期:2024-10-27 出版日期:2024-12-25 发布日期:2025-02-05
通讯作者: 姜壹夫,讲师,博士,E-mail:jiangyifu18@163.com
作者简介:张凯杰(2004—),男,主要研究方向为轻质合金热成形,E-mail:yszhanghust@163.com。
基金资助:
沈阳工程学院大学生创新创业训练计划(D202404132013170531)

Effect of pre-aging temperature on bake hardening response of AA7075 aluminum alloy

Zhang Kaijie^1,2, Jiang Yifu^1,2, Shi Jinrui^1,2, Yang Feng^1,2

1. School of Mechanical Engineering, Shenyang Institute of Engineering, Shenyang Liaoning 110136, China;
2. The Key Laboratory of Reliability and Health Management of Energy and Power Equipment in Liaoning Province, Shenyang Liaoning 110136, China

Received:2024-06-13 Revised:2024-10-27 Online:2024-12-25 Published:2025-02-05

摘要/Abstract

摘要： 采用(高分辨)透射电镜、显微硬度计以及拉伸试验机,研究了180 ℃×30 min烘烤前120~180 ℃×5 min预时效对AA7075高强铝合金烘烤硬化响应的影响。结果表明,当预时效前的预应变为3%~30%时,预应变的增大也会促使烘烤硬化效果更加明显。当预应变为5%时,随着预时效温度的升高(120~180 ℃),AA7075合金的η′强化相逐渐增多,强度和硬度分别从405 MPa和142 HV5升至 478 MPa和160 HV5。同时,当预时效处理为180 ℃×5 min时,基体存在一定量的η′相和少量的η相,在烘烤前添加预时效工艺可显著促进GP区的形成,烘烤硬化响应最好。

关键词: AA7075铝合金, 烘烤硬化响应, 微观组织, 拉伸性能

Abstract: Effect of pre-aging at 120-180 ℃ for 5 min before baking at 180 ℃ for 30 min on the bake hardening response of AA7075 high-strength aluminum alloy was studied using high-resolution transmission electron microscopy, microhardness tester, and tensile testing machine. The results indicate that when the pre-strain before pre-aging is 3%-30%, an increase in the pre-strain will also promote a more significant bake hardening effect. When the pre-strain is 5%, with the increase of pre-aging temperature (120-180 ℃), the η′ strengthening phase amount of the AA7075 alloy gradually increases, and the strength and hardness increase from 405 MPa and 142 HV5 to 478 MPa and 160 HV5, respectively. At the same time, when pre-aged at 180 ℃ for 5 min, there is a certain amount of η′ phase and a small amount of η phase in the matrix. Adding pre-aging process before baking enables to promote the formation of GP zone significantly, and the bake hardening response is the best.

Key words: AA7075 aluminum alloy, bake hardening response, microstructure, tensile property

中图分类号:

TG166.3

张凯杰, 姜壹夫, 施金汭, 杨峰. 预时效温度对AA7075铝合金烘烤硬化响应的影响[J]. 金属热处理, 2024, 49(12): 90-93.

Zhang Kaijie, Jiang Yifu, Shi Jinrui, Yang Feng. Effect of pre-aging temperature on bake hardening response of AA7075 aluminum alloy[J]. Heat Treatment of Metals, 2024, 49(12): 90-93.

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预时效温度对AA7075铝合金烘烤硬化响应的影响

Effect of pre-aging temperature on bake hardening response of AA7075 aluminum alloy

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