Anomalous Evolution of Strength and Microstructure of High-Entropy Alloy CoCrFeNiMn after High-Pressure Torsion at 300 and 77 K

Aleksey V. Podolskiy, Yuriy O. Shapovalov, Elena D. Tabachnikova, Aleksandr S. Tortika, Mikhail A. Tikhonovsky, Bertalan Joni, Eva Ódor, Tamas Ungar, Stefan Maier, Christian Rentenberger, Michael J. Zehetbauer, Erhard Schafler

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3 Citations (Scopus)

Abstract

Ultrafine and nanocrystalline states of equiatomic face-centered cubic (fcc) high-entropy alloy (HEA) CoCrFeNiMn (“Cantor” alloy) are achieved by high-pressure torsion (HPT) at 300 K (room temperature, RT) and 77 K (cryo). Although the hardness after RT-HPT reaches exceptionally high values, those from cryo-HPT are distinctly lower, at least when the torsional strain lies beyond γ = 25. The values are stable even during long-time storage at ambient temperature. A similar paradoxal result is reflected by torque data measured in situ during HPT processing. The reasons for this paradox are attributed to the enhanced hydrostatic pressure, cryogenic temperature, and especially large shear strains achieved by the cryo-HPT. At these conditions, selected area electron diffraction (SAD) patterns indicate that a partial local phase change from fcc to hexagonal close-packed (hcp) structure occurs, which results in a highly heterogeneous structure. This heterogeneity is accompanied by both an increase in average grain size and especially a strong decrease in average dislocation density, which is estimated to mainly cause the paradox low strength.

Original languageEnglish
Article number1900752
JournalAdvanced Engineering Materials
DOIs
Publication statusAccepted/In press - Jan 1 2019

Keywords

  • Cantor alloy
  • cryogenic temperatures
  • high-entropy alloys
  • high-pressure torsion
  • plastic deformation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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    Podolskiy, A. V., Shapovalov, Y. O., Tabachnikova, E. D., Tortika, A. S., Tikhonovsky, M. A., Joni, B., Ódor, E., Ungar, T., Maier, S., Rentenberger, C., Zehetbauer, M. J., & Schafler, E. (Accepted/In press). Anomalous Evolution of Strength and Microstructure of High-Entropy Alloy CoCrFeNiMn after High-Pressure Torsion at 300 and 77 K. Advanced Engineering Materials, [1900752]. https://doi.org/10.1002/adem.201900752