Enhancing intergranular corrosion resistance of 7055 Al alloy by ultrasonic shot peening

被引：0
作者：
Liu, Hao [1 ]
Lv, Xuantong [1 ]
Zhang, Qianru [1 ]
Han, Mengjiao [2 ]
Sun, Qingqing [1 ]
机构：
[1] Sun Yat Sen Univ, Sch Mat, Shenzhen 518107, Peoples R China
[2] Songshan Lake Mat Lab, Dongguan, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2025年 / 1010卷
基金：
中国国家自然科学基金;
关键词：
Intergranular corrosion; Ultrasonic shot peening; AA; 7055; Nanoscale investigation; SEVERE PLASTIC-DEFORMATION; LOCALIZED CORROSION; ALUMINUM-ALLOYS; ZR ADDITIONS; MG ALLOY; BEHAVIOR; STRESS; MICROSTRUCTURE; CR; AEROSPACE;
D O I：
10.1016/j.jallcom.2024.177651
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
High strength 7000 series Al alloys are quite sensitive to intergranular corrosion (IGC) and generally a trade-off between IGC resistance and hardness exists in such Al alloys. Here, by using ultrasonic shot peening (USSP) we fabricate a gradient AA7055 whose IGC is significantly enhanced in both 57 g/L NaCl + 10 mL/L H2O2 solution and 3.5 wt% NaCl solution, whereas the surface hardness increases by 10 %. TEM microstructure characterization and nanoscale investigation of corrosion indicate that the improvement in IGC resistance can be attributed to the disappearance of grain boundary precipitates and precipitate free zones. Surface hardening mechanism is also revealed.
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页数：12
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