Unraveling the effect of dislocations and deformation-induced boundaries on environmental hydrogen embrittlement behavior of a cold-rolled Al–Zn–Mg–Cu alloy

Masoud Moshtaghi, Mahdieh Safyari, Shigeru Kuramoto, Tomohiko Hojo

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The effect of dislocation substructure, and deformation-induced boundaries on the hydrogen embrittlement (HE) behavior and the fracture mechanism of a 7xxx series aluminum alloy was investigated using X-ray diffraction line-profile analysis, electron backscatter diffraction, transmission electron microscopy, thermal desorption spectroscopy, and visualization of hydrogen. Hydrogen resides at interstitial lattice sites, statistically-stored dislocations (SSDs), and high-angle boundaries (HABs). SSDs are not the main trap site affecting HE behavior of the alloy. However, the HABs with the high desorption energy act as an almost irreversible trap site, which strongly absorbs hydrogen. It was firstly reported that the higher density of HABs as a strong trap site in a deformed 7xxx series aluminum alloy leads to decreasing the possibility of building up a critical hydrogen concentration required for crack initiation in a typical HAB, resulting in an excellent hydrogen embrittlement resistance.

Original languageEnglish
Pages (from-to)8285-8299
Number of pages15
JournalInternational Journal of Hydrogen Energy
Volume46
Issue number11
DOIs
Publication statusPublished - 2021 Feb 11

Keywords

  • Aluminum alloys
  • High-angle boundaries
  • Hydrogen embrittlement
  • Plastic deformation
  • Statistically-stored dislocations
  • Trap density

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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