Correlations among stress corrosion cracking, grain-boundary microchemistry, and Zn content in high Zn-containing Al-Zn-Mg-Cu alloys

被引：24
|
作者：
Yuan, Ding-ling [1 ,2 ]
Chen, Song-yi [1 ,2 ]
Chen, Kang-hua [1 ,2 ,3 ]
Huang, Lan-ping [1 ,2 ]
Chang, Jiang-yu [1 ,2 ]
Zhou, Liang [1 ,2 ]
Ding, Yun-feng [2 ,3 ]
机构：
[1] Cent South Univ, Light Alloy Res Inst, Changsha 410083, Peoples R China
[2] Cent South Univ, Collaborat Innovat Ctr Adv Nonferrous Struct Mat, Changsha 410083, Peoples R China
[3] Cent South Univ, Natl Key Lab Sci & Technol Natl Def High Strengt, Changsha 410083, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2021年 / 31卷 / 08期
关键词：
Al-Zn-Mg-Cu alloy; stress corrosion cracking; Zn content; grain-boundary microchemistry; HYDROGEN EMBRITTLEMENT; MECHANICAL-PROPERTIES; LOCALIZED-CORROSION; ALUMINUM-ALLOYS; ZR ADDITIONS; MINOR SC; BEHAVIOR; MICROSTRUCTURE; PRECIPITATION; COPPER;
D O I：
10.1016/S1003-6326(21)65650-9
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The correlations among the corrosion behaviour, grain-boundary microchemistry, and Zn content in Al-Zn-Mg-Cu alloys were studied using stress corrosion cracking (SCC) and intergranular corrosion (IGC) tests, combined with scanning electron microscopy (SEM) and high-angle angular dark field scanning transmission electron microscopy (HAADF-STEM) microstructural examinations. The results showed that the tensile strength enhancement of high Zn-containing Al-Zn-Mg-Cu alloys was mainly attributed to the high density nano-scale matrix precipitates. The SCC plateau velocity for the alloy with 11.0 wt.% Zn was about an order of magnitude greater than that of the alloy with 7.9 wt.% Zn, which was mainly associated with Zn enrichment in grain boundary precipitates and wide precipitates-free zones. The SCC mechanisms of different Zn-containing alloys were discussed based on fracture features, grain-boundary microchemistry, and electrochemical properties.
引用
收藏
页码：2220 / 2231
页数：12
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