Temperature- and strain-dependent thermally-activated deformation mechanism of a ferrous medium-entropy alloy

Jungwan Lee, Jongun Moon, Jae Wung Bae, Jeong Min Park, Hyeonseok Kwon, Hidemi Kato, Hyoung Seop Kim

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, quasi-static tensile properties of Fe60Co15Ni15Cr10 (at%) ferrous medium-entropy alloy at 298 K and 77 K were investigated in terms of thermally-activated deformation mechanism. Relatively high strain rate sensitivity and low activation volume were estimated using strain rate jump tests at 77 K where deformation-induced martensitic transformation took place, compared to those at 298 K. Different rate-controlling mechanisms were identified for early and latter deformation at both temperatures considering the plastic strain. Dislocation behaviors, e.g., cross-slip or dislocation accumulation, based on the thermally-activated deformation mechanism, support the outstanding cryogenic tensile properties of the present alloy.

Original languageEnglish
Article number107202
JournalIntermetallics
Volume134
DOIs
Publication statusPublished - 2021 Jul

Keywords

  • Dislocation geometry and arrangement
  • High-entropy alloys
  • Martensitic transformation
  • Nucleation and growth
  • Plastic deformation mechanisms

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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