Effects of Heating-aging on the Microstructure and Properties of 7050 Aluminum Alloy

Zhou Yan; Xia Hanyi; Shi Kun; Yang Xiangjie

doi:10.15980/j.tzzz.2021.06.014

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Effects of Heating-aging on the Microstructure and Properties of 7050 Aluminum Alloy
Vol. 41, Issue 6, Pages: 730-733(2021)
Published： 2021 ，
DOI： 10.15980/j.tzzz.2021.06.014

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[1]周炎,夏涵羿,史坤,杨湘杰.升温时效对7050铝合金组织及性能的影响[J].特种铸造及有色合金,2021,41(06):730-733.

Zhou Yan, Xia Hanyi, Shi Kun, et al. Effects of Heating-aging on the Microstructure and Properties of 7050 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 41(6):730-733(2021)
[1]周炎,夏涵羿,史坤,杨湘杰.升温时效对7050铝合金组织及性能的影响[J].特种铸造及有色合金,2021,41(06):730-733. DOI： 10.15980/j.tzzz.2021.06.014.

Zhou Yan, Xia Hanyi, Shi Kun, et al. Effects of Heating-aging on the Microstructure and Properties of 7050 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 41(6):730-733(2021) DOI： 10.15980/j.tzzz.2021.06.014.

摘要

研究了初始温度为100℃

不同的升温时效工艺对7050铝合金硬度、电导率、室温拉伸性能、微观组织的影响。结果表明

当升温速率为20℃/h时

晶内析出相的平均尺寸和尺寸范围随终止温度的升高不断增大;终止温度为200℃时

升温速率为40℃/h的平均尺寸和尺寸范围较20℃/h的小。硬度和室温拉伸性能随着析出相尺寸增大先增大后减小

断口类型均为包含沿晶断裂和穿晶断裂的混合型断口;电导率随着升温时效的进行一直增长。通过调整升温时效的升温速率和终止温度

能得到兼具较高强度和良好耐腐蚀性能的7050铝合金

且时效所需时间短。

Abstract

The effects of different heating-aging process at initial temperature of 100 ℃ on hardness

conductivity

room temperature tensile properties and microstructure of 7050 aluminum alloy were investigated. The results indicate that the average size and size range of precipitates are increased continuously with the increase of the final aging temperature at the heating rate of 20 ℃/h

which is larger than that at 40 ℃/h when the final aging temperature is 200 ℃. The hardness and room temperature tensile properties of the 7050 aluminum alloy are firstly increased and then decreased with the increase of precipitate size

and the fracture is characterized by mixture of intergranular and transgranular fracture. Meanwhile the conductivity is increased with the heating-aging process. The 7050 aluminum alloy with excellent strength and corrosion resistance can be obtained by adjusting the heating rate and final aging temperature

which requires short aging time.