Effect of two-stage overaging on microstructure and corrosion properties of an Al-Zn-Mg-Cu alloy

被引：26
作者：
Cheng, Quanshi [1 ,4 ]
Ye, Lingying [1 ,2 ,3 ]
Huang, Qingmei [1 ]
Dong, Yu [1 ]
Liu, Shengdan [1 ,2 ,3 ]
机构：
[1] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China
[2] Cent South Univ, Key Lab Nonferrous Met Mat Sci & Engn, Minist Educ, Changsha 410083, Peoples R China
[3] Cent South Univ, Nonferrous Met Oriented Adv Struct Mat & Mfg Coope, Changsha 410083, Peoples R China
[4] Henan Aerosp Precis Machining Co Ltd, Xinyang 464000, Peoples R China
来源：
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2022年 / 20卷
关键词：
Two-stage overaging; Al-Zn-Mg-Cu alloy; Electrical conductivity; Stress corrosion cracking resistance; TRANSMISSION ELECTRON-MICROSCOPY; HYDROGEN EMBRITTLEMENT; HEAT-TREATMENT; LOCALIZED-CORROSION; CRACKING; BEHAVIOR; STRENGTH; SUSCEPTIBILITY; PHASES;
D O I：
10.1016/j.jmrt.2022.08.098
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A two-stage overaging process was proposed to improve the electrical conductivity and stress corrosion cracking resistance (SCCR) of an Al-Zn-Mg-Cu alloy. The overaging process include a low-temperature aging at 120 ? for 5 h and a subsequent aging at 177 ? for 8, 14 and 24 h. The SCCR of the samples aged at 120 ?/5 h + 177 ?/24 h was higher than that of the T6 temper, at which the I-SSRT is 1.2% and the electrical conductivity is 39.0%IACS. The increase of electrical conductivity is caused by the depletion of solution atoms during overaging. Meanwhile, the improvement of SCCR resistance is caused by the coarsening of grain boundary precipitates with higher Cu content. The tensile strength decreased from 663.5 MPa to 519.7 MPa, which is caused by the coarsen of strengthening precipitates in grains during overaging process. (C) 2022 The Author(s). Published by Elsevier B.V.
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收藏
页码：3185 / 3194
页数：10
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