Effect of Overaging on Fatigue Crack Propagation and Stress Corrosion Cracking Behaviors of an Al-Zn-Mg-Cu Alloy Thick Plate

被引：14
作者：
Lin, Lianghua [1 ,2 ]
Liu, Zhiyi [1 ]
Han, Xiangnan [1 ]
Liu, Wenjuan [1 ]
机构：
[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[2] East China Univ Technol, Sch Mech & Elect Engn, Nanchang 330013, Jiangxi, Peoples R China
来源：
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2018年 / 27卷 / 08期
关键词：
aluminum alloy; fatigue crack propagation; overaging; stress corrosion cracking; 2524; ALUMINUM-ALLOY; FRACTURE-BEHAVIOR; GP-ZONES; PRECIPITATION; STRENGTH; RETROGRESSION; MECHANISMS; RESISTANCE; GROWTH; SIZE;
D O I：
10.1007/s11665-018-3518-0
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The fatigue property as well as stress corrosion cracking (SCC) resistance of an Al-Zn-Mg-Cu alloy thick plate in peak-aged and overaged tempers (T7351 and T7651) is systematically investigated by fatigue crack propagation (FCP) test and slow strain rate test (SSRT). Microstructural characterization is examined by transmission electron microscopy and scanning electron microscopy. Results reveal that the T7351 alloy has lower strength but higher electrical conductivity as compared to T7651 alloy. The FCP resistance of T7351 alloy is superior to that of the T7651 alloy due to the coarser precipitates in the highly overaged alloy in which the strain localization is reduced by promoting homogeneous slip. In addition, the SSRT test suggests a higher SCC resistance in T7351 alloy. The enhanced SCC resistance is found to depend on grain boundary precipitate characteristics and crack propagation resistance of the alloys.
引用
收藏
页码：3824 / 3830
页数：7
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