Phase composition, microhardness, mechanical and acoustic properties of nonequiatomic medium-entropy alloys FexMn80-xCo10Cr10 (x = 40 and 50) in different structural states
Authors: Tabachnikova, E., Shumilin, S., Kolodiy, I., Hryhorova, T., Semerenko, Y., Smirnov, S., Kashuba, I., Shapovalov, Y., Tykhonovska, T., Tikhonovsky, M., Huang, Y., Langdon, T.G.
Journal: Key Engineering Materials
Publication Date: 03/02/2026
Volume: 1041
Pages: 19-27
Publisher: Trans Tech Publications Ltd.
eISSN: 1662-9795
ISSN: 1013-9826
DOI: 10.4028/p-SNRx1H
Abstract:At temperatures of 290 K and 77 K, the phase composition and mechanical properties of nonequiatomic medium-entropy (MEA) alloys Fe40Mn40Co10Cr10 and Fe50Mn30Co10Cr10 were compared in the coarse-grained (CG) and nanostructured (NS) states, in which additional deformation mechanisms are activated under load: phase transformations in the MEA Fe50Mn30Co10Cr10 (MEA TRIP) and twinning in the MEA Fe40Mn40Co10Cr10 alloy (MEA TWIP). It is shown that in the NS state in both alloys, in contrast to the CG state, a complete phase transition from the fcc to the hcp phase is observed, the content of which weakly depends on the temperature and the number of torsion revolutions during high-pressure torsion (HPT). The transition from the CG to the NS state leads to an increase in the microhardness (in the NS MEA TWIP by 3.7 and in the NS MEA TRIP by 2.25). In the CG state, a thermally activated character of plastic deformation is observed for both alloys in the temperature range of 290 – 77 K. In the NS state, MEA TWIP remains plastic under active compression deformation at 290 K and 77 K, whereas in NS MEA TRIP under similar conditions, macroscopic plasticity is absent. Tensile deformation up to 50 % at 30 K in the CG state for both alloys leads to a significant decrease in the absolute values of Young's modulus over the entire temperature range.
Source: Manual
Preferred by: Yi Huang