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- Title
Switching nanoprecipitates to resist hydrogen embrittlement in high-strength aluminum alloys.
- Authors
Wang, Yafei; Sharma, Bhupendra; Xu, Yuantao; Shimizu, Kazuyuki; Fujihara, Hiro; Hirayama, Kyosuke; Takeuchi, Akihisa; Uesugi, Masayuki; Cheng, Guangxu; Toda, Hiroyuki
- Abstract
Hydrogen drastically embrittles high-strength aluminum alloys, which impedes efforts to develop ultrastrong components in the aerospace and transportation industries. Understanding and utilizing the interaction of hydrogen with core strengthening elements in aluminum alloys, particularly nanoprecipitates, are critical to break this bottleneck. Herein, we show that hydrogen embrittlement of aluminum alloys can be largely suppressed by switching nanoprecipitates from the η phase to the T phase without changing the overall chemical composition. The T phase strongly traps hydrogen and resists hydrogen-assisted crack growth, with a more than 60% reduction in the areal fractions of cracks. The T phase-induced reduction in the concentration of hydrogen at defects and interfaces, which facilitates crack growth, primarily contributes to the suppressed hydrogen embrittlement. Transforming precipitates into strong hydrogen traps is proven to be a potential mitigation strategy for hydrogen embrittlement in aluminum alloys. Hydrogen embrittlement limits the strengthening of aluminum alloys. Here, the authors propose the precipitate switching strategy to effectively control hydrogen embrittlement of high-strength aluminum alloys by utilizing the hydrogen trapping effect at T phase.
- Subjects
HYDROGEN embrittlement of metals; ALUMINUM alloys; FRACTURE mechanics; ALUMINUM cans; AEROSPACE industries; TRANSPORTATION industry; EMBRITTLEMENT; STRESS corrosion cracking
- Publication
Nature Communications, 2022, Vol 13, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-022-34628-4