Journal
METALS AND MATERIALS INTERNATIONAL
Volume 28, Issue 11, Pages 2637-2645Publisher
KOREAN INST METALS MATERIALS
DOI: 10.1007/s12540-021-01163-8
Keywords
High entropy alloy; Hydrogen embrittlement; Stacking fault energy; Weak-beam dark-field
Funding
- Korea Institute of Science and Technology, South Korea [2E30993]
- Korea Institute for Advancement of Technology (KIAT) - Korea Government (MOTIE) [P0002019]
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This study quantitatively evaluated the hydrogen-induced variation of stacking fault energy (SFE) of a CrMnFeCoNi high-entropy alloy (HEA) using transmission electron microscopy (TEM) with weak-beam dark-field (WBDF) technique. It was observed that the width of Shockley partial dislocations increased after hydrogen absorption, indicating a decrease in SFE of the alloy. This is the first direct observation of stacking faults under the influence of hydrogen in a face-centered cubic metallic structure.
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.
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