Grain refinement effect on hydrogen embrittlement resistance of an equiatomic CoCrFeMnNi high-entropy alloy

Motomichi Koyama; Kenshiro Ichii; Kaneaki Tsuzaki

doi:10.1016/j.ijhydene.2019.04.280

Grain refinement effect on hydrogen embrittlement resistance of an equiatomic CoCrFeMnNi high-entropy alloy

Motomichi Koyama, Kenshiro Ichii, Kaneaki Tsuzaki

Strength of materials

Research output: Contribution to journal › Article

Abstract

We investigated the grain refinement effect on the resistance to hydrogen embrittlement in an equiatomic CoCrFeMnNi high-entropy alloy. In a 100 MPa hydrogen gas pre-charging condition, grain refinement to 1.9 μm improved the hydrogen embrittlement resistance in terms of the strength-elongation balance. In particular, the tensile strength of the grain refined high-entropy alloy did not decrease by hydrogen uptake. However, when the σ phase formed at a relatively low temperature, both the strength and elongation decreased due to hydrogen charging.

Original language	English
Pages (from-to)	17163-17167
Number of pages	5
Journal	International Journal of Hydrogen Energy
Volume	44
Issue number	31
DOIs	https://doi.org/10.1016/j.ijhydene.2019.04.280
Publication status	Published - Jun 21 2019

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All Science Journal Classification (ASJC) codes

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

Cite this

Koyama, M., Ichii, K., & Tsuzaki, K. (2019). Grain refinement effect on hydrogen embrittlement resistance of an equiatomic CoCrFeMnNi high-entropy alloy. International Journal of Hydrogen Energy, 44(31), 17163-17167. https://doi.org/10.1016/j.ijhydene.2019.04.280

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10.1016/j.ijhydene.2019.04.280