时效工艺对2219铝合金组织和力学性能的影响

doi:10.13251/j.issn.0254-6051.2023.10.017

金属热处理 ›› 2023, Vol. 48 ›› Issue (10): 123-128.DOI: 10.13251/j.issn.0254-6051.2023.10.017

时效工艺对2219铝合金组织和力学性能的影响

王会敏, 李炎光, 马秉馨

河南工学院材料科学与工程学院, 河南新乡 453003

收稿日期:2023-04-19 修回日期:2023-08-08 出版日期:2023-10-25 发布日期:2023-12-07
作者简介:王会敏(1983—),男,讲师,博士,主要研究方向为金属材料塑性成形及热处理,E-mail:wanghuimin12@126.com
基金资助:
河南省科技攻关项目(222102230021);河南省高校重点科研项目(21B430003)

Effect of aging process on microstructure and mechanical properties of 2219 aluminum alloy

Wang Huimin, Li Yanguang, Ma Bingxin

College of Materials Sciences and Engineering, Henan Institute of Technology, Xinxiang Henan 453003, China

Received:2023-04-19 Revised:2023-08-08 Online:2023-10-25 Published:2023-12-07

摘要/Abstract

摘要： 采用力学性能测试、扫描电镜(SEM)和透射电镜(TEM)等方法,研究了时效工艺对2219铝合金组织和力学性能的影响。结果表明,在120 ℃时效时,合金时效响应缓慢,长时间处于欠时效状态,力学性能偏低,在150、165和175 ℃时效时,由于GP区和θ″相的叠加效应,时效强化曲线呈现双峰特征,时效过程分为欠时效、峰时效和过时效3个阶段,且随着时效温度提高,响应速度加快,到达峰值时间缩短,断后伸长率下降;综合考虑合金的强度和伸长率,2219铝合金适宜的时效工艺为165 ℃×24 h, 时效后合金的抗拉强度、屈服强度、断后伸长率分别为412.2 MPa、310.8 MPa和7.9%。

关键词: 2219铝合金, 时效工艺, 力学性能, 显微组织

Abstract: Effect of aging process on microstructure and mechanical properties of 2219 aluminum alloy was investigated by means of tensile test, transmission electron microscope (TEM) and scanning electron microscope (SEM). The results show that the aging hardening response of the 2219 aluminum alloy is very slow when the alloy is aged at 120 ℃, even aged for a long time, the alloy is still under aging. When the 2219 aluminum alloy is aged at 150, 165 and 175 ℃, it shows a dual-peak aging curve, owing to the overlap of precipitation of GP zones and formation of θ″ phase, and the aging process is divided into three stages as under-aging, peak-aging and over-aging. With the increase of aging temperature, the aging hardening response of the 2219 aluminum alloy becomes faster, the elongation and peak-aging time are reduced, so in comprehensive consideration of the strength and elongation of the alloy, the favorable aging process is at 165 ℃×24 h. After peak aging (165 ℃×24 h), the ultimate tensile strength, yield strength and elongation of the aluminum alloy are 412.2 MPa, 310.8 MPa and 7.9%, respectively.

Key words: 2219 aluminum alloy, aging process, mechanical properties, microstructure

中图分类号:

TG146

王会敏, 李炎光, 马秉馨. 时效工艺对2219铝合金组织和力学性能的影响[J]. 金属热处理, 2023, 48(10): 123-128.

Wang Huimin, Li Yanguang, Ma Bingxin. Effect of aging process on microstructure and mechanical properties of 2219 aluminum alloy[J]. Heat Treatment of Metals, 2023, 48(10): 123-128.

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时效工艺对2219铝合金组织和力学性能的影响

Effect of aging process on microstructure and mechanical properties of 2219 aluminum alloy

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