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

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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
Publication statusPublished - 2017 Sep 1

Keywords

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

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Moon, J., Qi, Y., Tabachnikova, E., Estrin, Y., Choi, W. M., Joo, S. H., Lee, B. J., Podolskiy, A., Tikhonovsky, M., & Kim, H. S. (2017). Deformation-induced phase transformation of Co20Cr26Fe20Mn20Ni14 high-entropy alloy during high-pressure torsion at 77 K. Materials Letters, 202, 86-88. https://doi.org/10.1016/j.matlet.2017.05.065