Effect of hydrogen-induced surface steps on the nanomechanical behavior of a CoCrFeMnNi high-entropy alloy revealed by in-situ electrochemical nanoindentation

Dong Wang; Xu Lu; Yun Deng; Di Wan; Zhiming Li; Afrooz Barnoush

doi:10.1016/j.intermet.2019.106605

Effect of hydrogen-induced surface steps on the nanomechanical behavior of a CoCrFeMnNi high-entropy alloy revealed by in-situ electrochemical nanoindentation

Dong Wang
, Xu Lu
, Yun Deng^*
, Di Wan
, Zhiming Li
, Afrooz Barnoush

^*Corresponding author for this work

Norwegian University of Science and Technology
Max Planck Institute for Iron Research
Central South University

Research output: Contribution to journal › Article › peer-review

40 Citations (Scopus)

Abstract

The effect of hydrogen on the nanomechanical properties of CoCrFeMnNi high-entropy alloy was investigated by in-situ electrochemical nanoindentation testing. The changes in surface morphology, elastic modulus, pop-in load, and hardness during hydrogen ingress and egress processes were systematically evaluated. The results show that hydrogen charging leads to the formation of irreversible slip lines accumulated as surface steps. Furthermore, the irreversible reduced pop-in load and elastic modulus, and reversible increased hardness are detected. In this paper, the mechanisms of hydrogen-induced surface steps together with their further influences on the nanomechanical properties are discussed in detail.

Original language	English
Article number	106605
Journal	Intermetallics
Volume	114
DOIs	https://doi.org/10.1016/j.intermet.2019.106605
Publication status	Published - Nov 2019
Externally published	Yes

Keywords

Electron channeling contrast imaging
High-entropy alloy
Hydrogen embrittlement
Hydrogen-induced surface steps
In-situ electrochemical nanoindentation
Nanomechanics

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10.1016/j.intermet.2019.106605

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@article{e621d7b7ddfe45258b5e54e9057654a6,

title = "Effect of hydrogen-induced surface steps on the nanomechanical behavior of a CoCrFeMnNi high-entropy alloy revealed by in-situ electrochemical nanoindentation",

abstract = "The effect of hydrogen on the nanomechanical properties of CoCrFeMnNi high-entropy alloy was investigated by in-situ electrochemical nanoindentation testing. The changes in surface morphology, elastic modulus, pop-in load, and hardness during hydrogen ingress and egress processes were systematically evaluated. The results show that hydrogen charging leads to the formation of irreversible slip lines accumulated as surface steps. Furthermore, the irreversible reduced pop-in load and elastic modulus, and reversible increased hardness are detected. In this paper, the mechanisms of hydrogen-induced surface steps together with their further influences on the nanomechanical properties are discussed in detail.",

keywords = "Electron channeling contrast imaging, High-entropy alloy, Hydrogen embrittlement, Hydrogen-induced surface steps, In-situ electrochemical nanoindentation, Nanomechanics",

author = "Dong Wang and Xu Lu and Yun Deng and Di Wan and Zhiming Li and Afrooz Barnoush",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2019",

month = nov,

doi = "10.1016/j.intermet.2019.106605",

language = "English",

volume = "114",

journal = "Intermetallics",

issn = "0966-9795",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Effect of hydrogen-induced surface steps on the nanomechanical behavior of a CoCrFeMnNi high-entropy alloy revealed by in-situ electrochemical nanoindentation

AU - Wang, Dong

AU - Lu, Xu

AU - Deng, Yun

AU - Wan, Di

AU - Li, Zhiming

AU - Barnoush, Afrooz

PY - 2019/11

Y1 - 2019/11

N2 - The effect of hydrogen on the nanomechanical properties of CoCrFeMnNi high-entropy alloy was investigated by in-situ electrochemical nanoindentation testing. The changes in surface morphology, elastic modulus, pop-in load, and hardness during hydrogen ingress and egress processes were systematically evaluated. The results show that hydrogen charging leads to the formation of irreversible slip lines accumulated as surface steps. Furthermore, the irreversible reduced pop-in load and elastic modulus, and reversible increased hardness are detected. In this paper, the mechanisms of hydrogen-induced surface steps together with their further influences on the nanomechanical properties are discussed in detail.

AB - The effect of hydrogen on the nanomechanical properties of CoCrFeMnNi high-entropy alloy was investigated by in-situ electrochemical nanoindentation testing. The changes in surface morphology, elastic modulus, pop-in load, and hardness during hydrogen ingress and egress processes were systematically evaluated. The results show that hydrogen charging leads to the formation of irreversible slip lines accumulated as surface steps. Furthermore, the irreversible reduced pop-in load and elastic modulus, and reversible increased hardness are detected. In this paper, the mechanisms of hydrogen-induced surface steps together with their further influences on the nanomechanical properties are discussed in detail.

KW - Electron channeling contrast imaging

KW - High-entropy alloy

KW - Hydrogen embrittlement

KW - Hydrogen-induced surface steps

KW - In-situ electrochemical nanoindentation

KW - Nanomechanics

UR - https://www.scopus.com/pages/publications/85071861631

U2 - 10.1016/j.intermet.2019.106605

DO - 10.1016/j.intermet.2019.106605

M3 - Article

AN - SCOPUS:85071861631

SN - 0966-9795

VL - 114

JO - Intermetallics

JF - Intermetallics

M1 - 106605

ER -

Effect of hydrogen-induced surface steps on the nanomechanical behavior of a CoCrFeMnNi high-entropy alloy revealed by in-situ electrochemical nanoindentation

Abstract

Keywords

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