The micromechanical properties of CoCrFeNiMnVx (x = 0-2) high-entropy alloys
Authors: Rusakova, H., Fomenko, L., Lubenets, S., Tikhonovsky, M., Kislyak, I., Tabachnikova, E., Huang, Y., Langdon, T.G.
Journal: Key Engineering Materials
Publication Date: 03/02/2026
Volume: 1041
Pages: 11-17
Publisher: Trans Tech Publications Ltd.
eISSN: 1662-9795
ISSN: 1013-9826
DOI: 10.4028/p-ZcxQA8
Abstract:The microhardness of CoCrFeNiMnVx (х = 0-2) high-entropy alloys (HEAs) was measured in the temperature range 77-293 K. At x ≤ 0.4, a significant monotonic increase in microhardness occurs with decreasing temperature, which indicates the thermally-activated character of plastic deformation of the material under the indenter. At x = 0.5, as well as at x = 0.75 and 0.85, athermal behavior of microhardness was detected in the ranges of 200-293 K and 150-293 K, respectively. The latter is apparently associated with the appearance in the indicated alloys, along with the FCC phase, of precipitates of the hard intermetallic sigma phase, which are athermal obstacles to the motion of dislocations. For the first time the microhardness of the sigma phase in the range of 77-293 K was measured; at 293 K and 77 K it was about 9.5 GPa and 12.5 GPa, respectively, which is approximately 5 times higher than the microhardness of the FCC alloy with x = 0.25.
Source: Manual
Preferred by: Yi Huang