Roles of the grain-boundary characteristics and distributions on hydrogen embrittlement in face-centered cubic medium-entropy V<sub>x</sub>Cr<sub>1-x</sub>CoNi alloys

Journal article (2023)

Authors

Dae Cheol Yang Korea University
Sang Yoon Song Korea University
Han Jin Kim Korea Institute of Science and Technology
Sang In Lee Korea Institute of Science and Technology
B. Dutta Team Marcel Sluiter - Mechanical, Maritime and Materials Engineering
Young Kyun Kim Korea Institute of Materials Science
Jae Hyeok Shim Sungkyunkwan University, Korea Institute of Science and Technology
Jin Yoo Suh Korea Institute of Science and Technology
Young Sang Na Korea Institute of Materials Science
Seok Su Sohn Korea University
Research Group
Team Marcel Sluiter (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2023 Dae Cheol Yang, Sang Yoon Song, Han Jin Kim, Sang In Lee, B. Dutta, Young Kyun Kim, Jae Hyeok Shim, Jin Yoo Suh, Young Sang Na, Seok Su Sohn
DOI
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https://doi.org/10.1016/j.msea.2023.145028
Hydrogen embrittlement Stacking fault energy Medium-entropy alloy Grain boundary characteristics Solid-solution strengthening
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Published Date

2023

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Materials Science and Engineering

Research Group

Team Marcel Sluiter

Abstract

The issue of hydrogen embrittlement (HE) in face-centered (FCC) structured alloys is significant for H storage and transportation application due to unanticipated damage beyond its predicted service life. This unpredictable situation may harm human life and limit hydrogen to a reliable source of renewable energy in industrial fields. Recent research has suggested that multi-principal element alloys possess high resistance to HE. However, there has been limited exploration of how their unique properties affect the HE mechanisms. In this study, using simple model VCrCoNi alloys with analogous grain sizes, the reduction rate of ductility by hydrogen uptake was measured through a slow strain rate tensile test following electro-chemical H charging. Further, the origin of HE resistance was investigated by analyzing various factors such as hydrogen contents, fracture and deformation behaviors, and grain boundary properties using thermal desorption spectroscopy, scanning electron microscope, and electron backscatter diffraction. Despite the consistent trends of the H content, stacking fault energy, and stress with increasing V content, the resistance to HE is the highest for the alloy with an intermediate ratio of V and Cr, namely, for the V0.7Cr0.3CoNi alloy. Through the analysis of grain boundary characteristics, the high resistance is attributed to large fractions of special boundaries and special triple junctions and large twin-related domain size, which suppresses crack growth and interlinkage. The favorable grain boundary characteristics result from mechanical dynamic recovery, achieved by the competitive effects of solid-solution strengthening and stacking fault energy. Thus, the present study provides novel insights into enhancing HE resistance in FCC-structured alloys.