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Phase Composition, Microhardness, Mechanical and Acoustic Properties of Nonequiatomic Medium-Entropy Alloys FexMn80-xCo10Cr10 (x = 40 and 50) in Different Structural States
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Phase Composition, Microhardness, Mechanical and Acoustic Properties of Nonequiatomic Medium-Entropy Alloys FexMn80-xCo10Cr10 (x = 40 and 50) in Different Structural States

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Abstract:

At temperatures of 290 K and 77 K, the phase composition and mechanical properties ofnonequiatomic medium-entropy (MEA) alloys Fe40Mn40Co10Cr10 and Fe50Mn30Co10Cr10 werecompared in the coarse-grained (CG) and nanostructured (NS) states, in which additionaldeformation mechanisms are activated under load: phase transformations in the MEAFe50Mn30Co10Cr10 (MEA TRIP) and twinning in the MEA Fe40Mn40Co10Cr10 alloy (MEA TWIP). Itis shown that in the NS state in both alloys, in contrast to the CG state, a complete phase transitionfrom the fcc to the hcp phase is observed, the content of which weakly depends on the temperatureand the number of torsion revolutions during high-pressure torsion (HPT). The transition from theCG to the NS state leads to an increase in the microhardness (in the NS MEA TWIP by 3.7 and inthe NS MEA TRIP by 2.25). In the CG state, a thermally activated character of plastic deformationis observed for both alloys in the temperature range of 290 – 77 K. In the NS state, MEA TWIPremains plastic under active compression deformation at 290 K and 77 K, whereas in NS MEATRIP under similar conditions, macroscopic plasticity is absent. Tensile deformation up to 50 % at30 K in the CG state for both alloys leads to a significant decrease in the absolute values of Young'smodulus over the entire temperature range.

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Periodical:

Key Engineering Materials (Volume 1041)

Pages:

19-27

DOI:

https://doi.org/10.4028/p-SNRx1H

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Online since:

February 2026

Authors:

Elena Tabachnikova, Sergii Shumilin, Igor Kolodiy, Tetiana Hryhorova, Yuri Semerenko*, Sergei Smirnov, Ivan Kashuba, Yuri Shapovalov, Tetiana Tykhonovska, Mykhailo Tikhonovsky, Yi Huang, Terence G. Langdon

Keywords:

Medium-Entropy Alloy, Phase Transition, Plasticity, Strength, TRIP, TWIP, Young's Modulus

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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