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 › peer-review

6 Citations (Scopus)

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

All Science Journal Classification (ASJC) codes

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

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@article{9800eca1e3664efb896750037af946bb,

title = "Grain refinement effect on hydrogen embrittlement resistance of an equiatomic CoCrFeMnNi high-entropy alloy",

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.",

author = "Motomichi Koyama and Kenshiro Ichii and Kaneaki Tsuzaki",

note = "Funding Information: This work was supported by the JSPS KAKENHI [grant numbers JP16H06365 , JP17H04956 ] and the Japan Science and Technology Agency (JST) under the Industry-Academia Collaborative R&D program [grant number 20100113 ]. MK greatly appreciate Mr. Tatsuo Yokode and Prof. Tatsuya Morikawa for the support of cold rolling.",

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doi = "10.1016/j.ijhydene.2019.04.280",

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T1 - Grain refinement effect on hydrogen embrittlement resistance of an equiatomic CoCrFeMnNi high-entropy alloy

AU - Koyama, Motomichi

AU - Ichii, Kenshiro

AU - Tsuzaki, Kaneaki

N1 - Funding Information: This work was supported by the JSPS KAKENHI [grant numbers JP16H06365 , JP17H04956 ] and the Japan Science and Technology Agency (JST) under the Industry-Academia Collaborative R&D program [grant number 20100113 ]. MK greatly appreciate Mr. Tatsuo Yokode and Prof. Tatsuya Morikawa for the support of cold rolling.

PY - 2019/6/21

Y1 - 2019/6/21

N2 - 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.

AB - 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.

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