Deformation-induced phase transformation of Co20Cr26Fe20Mn20Ni14 high-entropy alloy during high-pressure torsion at 77 K

Jongun Moon, Yuanshen Qi, Elena Tabachnikova, Yuri Estrin, Won Mi Choi, Soo Hyun Joo, Byeong Joo Lee, Aleksey Podolskiy, Mikhail Tikhonovsky, Hyoung Seop Kim*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

A deformation-induced phase transformation in a face-centered cubic (FCC) Co20Cr26Fe20Mn20Ni14 high-entropy alloy during cryogenic high-pressure torsion (HPT) discovered in this work is reported. Thermodynamic calculations prove that in the Co20Cr26Fe20Mn20Ni14 alloy, a hexagonal close-packed (HCP) phase is stable at low temperatures. Microstructural and compositional analyses suggest that a diffusionless deformation-induced FCC-to-HCP phase transformation occurred during cryogenic HPT.

Original languageEnglish
Pages (from-to)86-88
Number of pages3
JournalMaterials Letters
Volume202
DOIs
StatePublished - 1 Sep 2017
Externally publishedYes

Keywords

  • High-entropy alloy
  • High-pressure torsion
  • Metals and alloys
  • Microstructure
  • Phase transformation

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