Localized Plasticity and Associated Cracking in Stable and Metastable High-Entropy Alloys Pre-Charged with Hydrogen

被引：11

作者：

Ichii, Kenshiro ^{[1
]}

Koyama, Motomichi ^{[1
]}

Tasan, Cemal Cem ^{[2
]}

Tsuzaki, Kaneaki ^{[1
,3
]}

机构：

[1] Kyushu Univ, Dept Mech Engn, Fukuoka, Fukuoka, Japan

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

[3] Kyushu Univ, Hydrogenious, Fukuoka, Fukuoka, Japan

来源：

ECF22 - LOADING AND ENVIRONMENTAL EFFECTS ON STRUCTURAL INTEGRITY | 2018年 / 13卷

基金：

日本科学技术振兴机构;

关键词：

High-entropy alloy; Hydrogen embrittlement; Martensitic transformation; Austenitic steels; Hydrogen desorption; EMBRITTLEMENT;

D O I：

10.1016/j.prostr.2018.12.119

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

We investigated hydrogen embrittlement in Fe20Mn20Ni20Cr20Co and Fe30Mn10Cr10Co (at.%) alloys pre-charged with 100 MPa hydrogen gas by tensile testing at three initial strain rates of 10(-4), 10(-3), and 10(-2) s(-1) at ambient temperature. The alloys are classified as stable and metastable austenite-based high-entropy alloys (HEAs), respectively. Both HEAs showed the characteristic hydrogen-induced degradation of tensile ductility. Electron backscatter diffraction analysis indicated that the reduction in ductility by hydrogen pre-charging was associated with localized plasticity-assisted intergranular crack initiation. It should be noted as an important finding that hydrogen-assisted cracking of the metastable HEA occurred not through a brittle mechanism but through localized plastic deformation in both the austenite and epsilon-martensite phases. (C) 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers.

引用

页码：716 / 721

页数：6

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