Influence of hydrogen on incipient plasticity in CoCrFeMnNi high-entropy alloy

被引：40

作者：

Yang, Guanghui ^{[1
]}

Zhao, Yakai ^{[2
]}

Lee, Dong-Hyun ^{[3
]}

Park, Jeong-Min ^{[1
]}

Seok, Moo-Young ^{[3
]}

Suh, Jin-Yoo ^{[4
]}

Ramamurty, Upadrasta ^{[5
]}

Jang, Jae-il ^{[1
]}

机构：

[1] Hanyang Univ, Div Mat Sci & Engn, Seoul 04763, South Korea

[2] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China

[3] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany

[4] Korea Inst Sci & Technol, High Temp Energy Mat Res Ctr, Seoul 02792, South Korea

[5] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore

来源：

SCRIPTA MATERIALIA | 2019年 / 161卷

基金：

新加坡国家研究基金会; 中国博士后科学基金;

关键词：

High-entropy alloy; Hydrogen; Nanoindentation; Vacancy; DISLOCATION NUCLEATION; GRAIN-BOUNDARIES; NANOINDENTATION; STRENGTH; RESISTANCE; BEHAVIOR; INDENTATION; TEMPERATURE; STRAIN;

D O I：

10.1016/j.scriptamat.2018.10.010

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The influence of hydrogen on the onset of plastic deformation in a CoCrFeMnNi high-entropy alloy (HEA) was examined through the analysis of the load at which first pop-in during spherical nanoindentation experiments occurs on hydrogen-charged and subsequently aged specimens. Results reveal that the dissolved hydrogen lowers the plastic flow resistance, indicated by the shear yield strength, tau(y), by modifying defect formation energies. Aging, subsequent to charging, leads to recovery of tau(y), but only partially. The results are discussed in terms of the vacancy-mediated dislocation nucleation, which is supported by the estimated activation volume for deformation. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：23 / 27

页数：5

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