TY - JOUR
T1 - Effect of V Content on the Microstructure and Mechanical Properties of High-Pressure Torsion Nanostructured CoCrFeMnNiVx High-Entropy Alloys
AU - Tabachnikova, Elena D.
AU - Smirnov, Sergej N.
AU - Shapovalov, Yuriy O.
AU - Kolodiy, Igor V.
AU - Levenets, Anastasia V.
AU - Tikhonovsky, Mikhail A.
AU - Zehetbauer, Michael J.
AU - Rentenberger, Christian
AU - Schafler, Erhard
AU - Huang, Yi
AU - Langdon, Terence G.
N1 - Publisher Copyright:
© 2024 The Author(s). Advanced Engineering Materials published by Wiley-VCH GmbH.
PY - 2024/10
Y1 - 2024/10
N2 - 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.
AB - 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.
KW - Cantor's alloys
KW - cryogenic temperatures
KW - high-entropy alloys
KW - mechanical properties
KW - micro- and nanostructures
KW - severe plastic deformation
KW - vanadium additives
UR - http://www.scopus.com/inward/record.url?scp=85198699950&partnerID=8YFLogxK
U2 - 10.1002/adem.202400692
DO - 10.1002/adem.202400692
M3 - Article
AN - SCOPUS:85198699950
SN - 1438-1656
VL - 26
JO - Advanced Engineering Materials
JF - Advanced Engineering Materials
IS - 19
M1 - 2400692
ER -