Download file (16.4 MB)
Download as zip (14 MB)

Collection

Citation

Description:

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.

Rights:

• 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/).

Keyword: Hydrogen embrittlement, Al–Zn–Mg alloys, Aluminum alloys, X-ray tomography, First-principles calculations

Date published: 2025-02-18

Publisher: Elsevier BV

Journal:

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

Funding:

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

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1016/j.ijhydene.2025.02.123

Related item:

Other identifier(s):

Contact agent:

Updated at: 2026-01-05 14:33:57 +0900

Published on MDR: 2026-01-05 16:20:02 +0900