Deformation of dual-phase high-entropy alloy Fe50Mn30Co10Cr10 at 123-973 K: Experiments and molecular dynamics simulations

XF Wang and LF Tang and YL Bian and HW Tang and Y Cai and NB Zhang and L Lu and SN Luo, MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 945, 148971 (2025).

DOI: 10.1016/j.msea.2025.148971

Temperature-dependent deformation properties and mechanisms of dual- phase high-entropy alloy (HEA) Fe50Mn30Co10Cr10 are investigated with uniaxial tensile testing and molecular dynamics (MD) simulations over a wide temperature range (from 123 K to 973 K). Along with post- deformation microstructure characterizations, a comprehensive relationship between deformation mechanisms and temperature is established. Both yield strength and ductility increase remarkably with decreasing temperature. At cryogenic temperatures, multiple deformation mechanisms are revealed, including dislocation slip and stacking fault in the face-center cubic (FCC) phase, dislocation slip and deformation twinning (10 (1) over bar2< 10 (1) over bar1 > extension twinning and 10 (1) over bar1< 10 (1) over bar2 > contraction twinning) in the hexagonal closed-packed (HCP) phase, and the FCC to HCP phase transformation. As the loading temperature increases, the FCC to HCP phase transformation and deformation twinning in the HCP phase are gradually suppressed. The MD simulations reveal evolution of dislocation density and phase fractions at different temperatures. The mechanical properties and the FCC to HCP phase transformation exhibit similar trends as the experiments. At elevated temperatures, the increased stacking fault energy heightens the stability of the FCC phase, then impeding the FCC to HCP phase transformation. This study provides a more general understanding on microstructure-mechanical property at different temperatures and temperature-dependent deformation mechanisms of this novel dual-phase HEA.

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