In-situ observation of martensitic transformation in an interstitial metastable high-entropy alloy during cathodic hydrogen charging

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

We show for the first time that a critical amount of dissolved hydrogen can induce a phase transformation from γ-austenite to ε-martensite in an interstitial metastable high-entropy alloy. This is demonstrated by in-situ hydrogen charging in combination with nanoindentation and scanning probe microscopy, plus further electron channeling contrast imaging, X-ray diffraction, and transmission Kikuchi diffraction techniques. The transformed martensites appear as bands on the surface along γ-{111} habit planes, leading to an irreversible increase of hardness. The hydrogen-induced internal stress together with the intrinsic hydrogen effects are proposed to be responsible for the martensitic transformation upon hydrogen charging.

Original languageEnglish
Pages (from-to)56-60
Number of pages5
JournalScripta Materialia
Volume173
DOIs
Publication statusPublished - Dec 2019
Externally publishedYes

Keywords

  • High-entropy alloy
  • Hydrogen
  • In-situ electrochemical nanoindentation
  • Martensitic transformation
  • Transmission Kikuchi diffraction

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