Effect of V Content on the Microstructure and Mechanical Properties of High-Pressure Torsion Nanostructured CoCrFeMnNiVx High-Entropy Alloys

Elena D. Tabachnikova, Sergej N. Smirnov, Yuriy O. Shapovalov, Igor V. Kolodiy, Anastasia V. Levenets, Mikhail A. Tikhonovsky, Michael J. Zehetbauer (Corresponding author), Christian Rentenberger, Erhard Schafler, Yi Huang, Terence G. Langdon

Publications: Contribution to journalArticlePeer Reviewed

Abstract

The article presents investigations of microstructure and low-temperature mechanical properties of nanostructured alloys CoCrFeMnNiVx (x = 0.15–0.75), processed by high-pressure torsion (HPT) at temperatures of 300 and 77 K. While at x ≥ 0.5 the values of microhardness (Hv) and compression yield stress (σ0.2) in samples after HPT at 77 K are larger than those in samples after HPT at 300 K, for x ≤ 0.2 surprisingly the opposite effect is observed. As in case of the undeformed CoCrFeMnNiVx alloys, the behavior for vanadium concentrations x ≥ 0.5 can be related to the formation of tetragonal σ-phase in addition to face-centered cubic matrix, while the anomalous behavior for x ≤ 0.2 arises from the formation of HPT-induced hexagonal martensitic phase. In the low-temperature ranges, i.e., 20–300 K in case of HPT nanostructured CoCrFeMnNiV0.2, and 150–300 K in case of HPT nanostructured CoCrFeMnNiV0.5, dependences of σ0.2(T) show characteristics of thermally activated dislocation movement. For the first time in high-entropy alloys, anomalous dependences of σ0.2(T) at temperatures 4.2–20 K for CoCrFeMnNiV0.2, and at 80–150 K for CoCrFeMnNiV0.5 are found, which indicate at the occurrence of nonthermal inertial dislocation movement.

Original languageEnglish
Article number2400692
Number of pages12
JournalAdvanced Engineering Materials
Volume26
Issue number19
DOIs
Publication statusPublished - Oct 2024

Austrian Fields of Science 2012

  • 103018 Materials physics
  • 103042 Electron microscopy

Keywords

  • Cantor's alloys
  • cryogenic temperatures
  • high-entropy alloys
  • mechanical properties
  • micro- and nanostructures
  • severe plastic deformation
  • vanadium additives

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