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

SCRIPTA MATERIALIA

卷:150

Article

Ichii, Kenshiro¹  Koyama, Motomichi¹  Tasan, Cemal Cem²  Tsuzaki, Kaneaki^1,3 

[1] Kyushu Univ, Dept Mech Engn, Nishi Ku, Motooka 744, Fukuoka 8190395, Japan

[2] MIT, Dept Mat Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[3] Kyushu Univ, Res Ctr Hydrogen Ind Use & Storage HYDROGENIUS, Nishi Ku, 744 Moto Oka, Fukuoka 8190395, Japan

关键词: High entropy alloy;    Hydrogen embrittlement;    Martensitic phase transformation;    Austenitic steels;    Hydrogen desorption;   

DOI  :  10.1016/j.scriptamat.2018.03.003

来源: Elsevier

【 摘 要 】

We investigated the effects of hydrogen on the mechanical response and embrittlement behavior of Fe20Mn2ONi20Cr2OCo 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 e-martensite phases - an unusual observation for the latter. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free