Influence of Hydrogen Absorption on Stacking Fault of Energy of a Face-Centered Cubic High Entropy Alloy

Han Jin Kim, Min Kyung Cho, Gyeungho Kim, Seung Yong Lee, Min Gu Jo, Hayoung Kim, Jin Yoo Suh, Joonho Lee

Research output: Contribution to journalArticlepeer-review

Abstract

Abstract: Hydrogen-induced variation of stacking fault energy (SFE) of a CrMnFeCoNi high-entropy alloy (HEA) was quantitatively evaluated by transmission electron microscopy (TEM) using weak-beam dark-field (WBDF) technique. Width of Shockley partial dislocations turned out to increase after hydrogen absorption, which indicates that hydrogen decreases the SFE of the alloy: from 31.5 ± 3.5 to 22.5 ± 2.5 mJm−2 by introduction of hydrogen into the lattice with approximate concentration of 115 wppm. This report provides the first direct observation of stacking faults under the influence of hydrogen in a face-centered cubic metallic structure. Graphical Abstract: [Figure not available: see fulltext.]

Original languageEnglish
JournalMetals and Materials International
DOIs
Publication statusAccepted/In press - 2022

Keywords

  • High entropy alloy
  • Hydrogen embrittlement
  • Stacking fault energy
  • Weak-beam dark-field

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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