通过超声波喷丸强化增强 7055 Al 合金的抗晶间腐蚀性能

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2024-11-19 DOI:10.1016/j.jallcom.2024.177651

Hao Liu, Xuantong Lv, Qianru Zhang, Mengjiao Han, Qingqing Sun

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引用次数: 0

摘要

高强度 7000 系列铝合金对晶间腐蚀 (IGC) 相当敏感，通常这类铝合金需要在抗 IGC 性和硬度之间进行权衡。在这里，我们利用超声波喷丸强化 (USSP) 技术制造了一种梯度 AA7055，它在 57 g/L NaCl + 10 mL/L H2O2 溶液和 3.5 wt% NaCl 溶液中的抗晶间腐蚀性能都显著增强，而表面硬度却提高了 10%。TEM 显微结构表征和纳米级腐蚀研究表明，抗 IGC 能力的提高可归因于晶界析出物和无析出物区的消失。此外，还揭示了表面硬化机理。

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

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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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.