The intergranular corrosion susceptibility of a heavily overaged Al-Mg-Si-Cu alloy

被引：94
|
作者：
Li, Hai [1 ,2 ]
Zhao, Peipei [1 ]
Wang, Zhixiu [1 ,2 ]
Mao, Qingzhong [1 ]
Fang, Bijun [1 ,2 ]
Song, Renguo [1 ,2 ]
Zheng, Zigiao [3 ]
机构：
[1] Changzhou Univ, Sch Mat Sci & Engn, Changzhou 213164, Peoples R China
[2] Changzhou Univ, Jiangsu Key Lab Mat Surface Sci & Technol, Changzhou 213164, Peoples R China
[3] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
来源：
CORROSION SCIENCE | 2016年 / 107卷
基金：
中国国家自然科学基金;
关键词：
Aluminum alloy; TEM; SEM; Intergranular corrosion (IGC); ALUMINUM-ALLOY; COPPER CONTENT; LOCALIZED CORROSION; HEAT-TREATMENT; PRECIPITATION; SEQUENCE; SILICON; RATIO;
D O I：
10.1016/j.corsci.2016.02.025
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Usually, underaged or peakaged Al-Mg-Si-Cu alloys are susceptible to intergranular corrosion (IGC), whereas overaging can eliminate the IGC susceptibility. However, it is found that the IGC susceptibility can be formed again when the alloys are heavily overaged further. The IGC susceptibility in the heavily overaged condition results from the anodic dissolution of the precipitation-free zones (PFZs) with the closely-neighbored grain boundary Q-phase (Al4Mg8Si7Cu2) precipitates acting as the continuous cathodes. The formation of the closely-neighbored grain boundary precipitates is attributed to their further growth via dissolving the adjacent matrix precipitates based on the Ostwald ripening process during the long-time overaging. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：113 / 122
页数：10
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