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

Research output: Contribution to journalArticlepeer-review

33 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 languageEnglish
Article number106605
JournalIntermetallics
Volume114
DOIs
Publication statusPublished - Nov 2019
Externally publishedYes

Keywords

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

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