Microstructural evolution, phase selection and properties of CoCrCuFeMn _x Ni high-entropy alloys

Abstract

Manganese was added to face-centered-cubic (fcc) high-entropy CoCrCuFeNi alloy to investigate the effects of Mn content on the microstructures, phase selection, and properties of CoCrCuFeMnxNi. CoCrCuFeMnxNi showed typical dendrite and interdendritic structures, and nanoprecipitates including Cu-rich cubic and Cr-rich acicular ones, were obtained in the interdendritic region. Calculated phase-selection-related parameters indicated that the formation of fcc phase was favored. Although two fcc structures were detected by X-ray diffraction, the interdendritic region showed body-centered-cubic, Cr-rich nanoprecipitates when x < 0.5. It is worth noting that the CoCrCuFeMn2.0Ni interdendrites showed an amorphous phase. CoCrCuFeMnxNi showed considerable ductility and increasing compressive strengths with increasing Mn content.

Evaluation of microstructural and corrosion resistance of as-cast Cu45Mn25Al15Fe5Cr5Ni5 high entropy alloy

“…Cu containing high entropy alloys attracted attention due to its unique solidification path in terms of presence of liquid phase separation phenomenon [10][11][12]. The addition of Cu to FeMnCrNiCo alloy shows the formation of two fcc phases fcc1/fcc2 dual structure [10][11][12][13][14][15][16][17]. In addition, Tong et al [18], investigated the effect of Al on the mechanical properties of CoCrCuFeNi system.…”