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Our study investigates how hydrogen trapped at interfaces of MgZn2 precipitates affects hydrogen embrittlement in Al–Zn–Mg alloys. Al–Zn–Mg alloys featuring various aged microstructures were prepared, and their hydrogen embrittlement behaviors were monitored in situ during tensile tests via synchrotron radiation X-ray micro- tomography. The changes in the interfacial properties of MgZn2 instigated a discernible transition in the qua- sicleavage and intergranular fractures. First-principles calculations revealed that the hydrogen trapping energy at semicoherent interfaces of MgZn2 is significantly high at 0.56 eV/atom, and multiple hydrogen trapping leads to a substantial reduction in interfacial cohesive energy. Hydrogen partitioning analysis of all trapping sites, including vacancies, grain boundaries, and MgZn2 interfaces, demonstrated that in overaged alloys, more than 90% of the hydrogen was trapped at semicoherent interfaces. The hydrogen trapped at the semicoherent interface of MgZn2 decreased the interfacial cohesive energy, causing semispontaneous decohesion and quasi- cleavage fracture in the Al–Zn–Mg alloys.

権利情報:

• Creative Commons BY Attribution 4.0 International
  Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

キーワード: Hydrogen embrittlement, Al–Zn–Mg alloys, Aluminum alloys, X-ray tomography, First-principles calculations

刊行年月日: 2025-02-18

出版者: Elsevier BV

掲載誌:

• International Journal of Hydrogen Energy (ISSN: 03603199) vol. 109 p. 1421-1436

研究助成金:

• Japan Science and Technology Agency JPMJCR1995 (CREST)
• JSPS 23K04413 (Grant-in-Aid for Scientific Research)
• Light Metal Educational Founda

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.ijhydene.2025.02.123

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更新時刻: 2026-01-05 14:33:57 +0900

MDRでの公開時刻: 2026-01-05 16:20:02 +0900