Comparative study of hydrogen embrittlement in stable and metastable high-entropy alloys

Kenshiro Ichii; Motomichi Koyama; Cemal Cem Tasan; Kaneaki Tsuzaki

doi:10.1016/j.scriptamat.2018.03.003

Comparative study of hydrogen embrittlement in stable and metastable high-entropy alloys

Kenshiro Ichii, Motomichi Koyama, Cemal Cem Tasan, Kaneaki Tsuzaki

Strength of materials

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77 Citations (Scopus)

Abstract

We investigated the effects of hydrogen on the mechanical response and embrittlement behavior of Fe20Mn20Ni20Cr20Co and Fe30Mn10Cr10Co (at.%) alloys precharged with 100 MPa hydrogen gas. These alloys can be classified as stable and metastable austenite-based high entropy alloys (HEAs), respectively. We carried out tensile tests at initial strain rates of 10⁻⁴ and 10⁻² s⁻¹ at ambient temperature. Both HEAs revealed hydrogen embrittlement associated with localized plasticity-assisted intergranular crack initiation. It is important to note that hydrogen-assisted cracking of the metastable HEA occurred via localized plasticity for both the austenite and ε-martensite phases – an unusual observation for the latter.

Original language	English
Pages (from-to)	74-77
Number of pages	4
Journal	Scripta Materialia
Volume	150
DOIs	https://doi.org/10.1016/j.scriptamat.2018.03.003
Publication status	Published - Jun 2018

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2018.03.003

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title = "Comparative study of hydrogen embrittlement in stable and metastable high-entropy alloys",

abstract = "We investigated the effects of hydrogen on the mechanical response and embrittlement behavior of Fe20Mn20Ni20Cr20Co and Fe30Mn10Cr10Co (at.%) alloys precharged with 100 MPa hydrogen gas. These alloys can be classified as stable and metastable austenite-based high entropy alloys (HEAs), respectively. We carried out tensile tests at initial strain rates of 10−4 and 10−2 s−1 at ambient temperature. Both HEAs revealed hydrogen embrittlement associated with localized plasticity-assisted intergranular crack initiation. It is important to note that hydrogen-assisted cracking of the metastable HEA occurred via localized plasticity for both the austenite and ε-martensite phases – an unusual observation for the latter.",

author = "Kenshiro Ichii and Motomichi Koyama and Tasan, {Cemal Cem} and Kaneaki Tsuzaki",

note = "Funding Information: This work was financially supported by JSPS KAKENHI ( JP16H06365 and JP17H04956 ) and the Japan Science and Technology Agency (JST) (grant number: 20100113 ) under Industry-Academia Collaborative R&D Program. Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

year = "2018",

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doi = "10.1016/j.scriptamat.2018.03.003",

language = "English",

volume = "150",

pages = "74--77",

journal = "Scripta Materialia",

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T1 - Comparative study of hydrogen embrittlement in stable and metastable high-entropy alloys

AU - Ichii, Kenshiro

AU - Koyama, Motomichi

AU - Tasan, Cemal Cem

AU - Tsuzaki, Kaneaki

N1 - Funding Information: This work was financially supported by JSPS KAKENHI ( JP16H06365 and JP17H04956 ) and the Japan Science and Technology Agency (JST) (grant number: 20100113 ) under Industry-Academia Collaborative R&D Program. Publisher Copyright: © 2018 Elsevier Ltd

PY - 2018/6

Y1 - 2018/6

N2 - We investigated the effects of hydrogen on the mechanical response and embrittlement behavior of Fe20Mn20Ni20Cr20Co and Fe30Mn10Cr10Co (at.%) alloys precharged with 100 MPa hydrogen gas. These alloys can be classified as stable and metastable austenite-based high entropy alloys (HEAs), respectively. We carried out tensile tests at initial strain rates of 10−4 and 10−2 s−1 at ambient temperature. Both HEAs revealed hydrogen embrittlement associated with localized plasticity-assisted intergranular crack initiation. It is important to note that hydrogen-assisted cracking of the metastable HEA occurred via localized plasticity for both the austenite and ε-martensite phases – an unusual observation for the latter.

AB - We investigated the effects of hydrogen on the mechanical response and embrittlement behavior of Fe20Mn20Ni20Cr20Co and Fe30Mn10Cr10Co (at.%) alloys precharged with 100 MPa hydrogen gas. These alloys can be classified as stable and metastable austenite-based high entropy alloys (HEAs), respectively. We carried out tensile tests at initial strain rates of 10−4 and 10−2 s−1 at ambient temperature. Both HEAs revealed hydrogen embrittlement associated with localized plasticity-assisted intergranular crack initiation. It is important to note that hydrogen-assisted cracking of the metastable HEA occurred via localized plasticity for both the austenite and ε-martensite phases – an unusual observation for the latter.

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DO - 10.1016/j.scriptamat.2018.03.003

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EP - 77

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Comparative study of hydrogen embrittlement in stable and metastable high-entropy alloys

Abstract

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