Microstructural and Tribological Characteristics of In Situ Induced Chrome Carbide Strengthened CoCrFeMnNi High-Entropy Alloys

Bulk (CoCrFeMnNi)100−xCx (x = 0, 0.2, 0.6, 0.8. 1.0. 1.2 wt.%) high-entropy alloys (HEAs) prepared via a discharge plasma sintering process were found to be composed of a simple FCC solid solution. With increasing C concentration, the grain of the HEAs transformed from columnar to equiaxial and the abundance of precipitated M7C3 and M23C6 phases increased. The valence state of Co, Fe, Mn, and Ni was not found to change with C concentration, but...