Synthesis of single-phase high-entropy carbides from a mixture of pre-mechanically alloyed CrNbMoWV HEA powders and carbon

Abstract

In this paper, single-phase chemically homogeneous high-entropy ceramics (HEC) were synthesized from a mixture of pre-mechanically alloyed CrNbMoWV high-entropy alloy (HEA) powders and carbon. High-entropy CrNbMoWV carbides were obtained for the first time. Mechanical alloying (MA) of a CrNbMoWV alloy with different process inputs times made it possible to obtain a single-phase powder with a body-centered cubic lattice and a uniform distribution of chemical elements. During the sintering of the mixture of pre-mechanically alloyed HEA powders with carbon by SPS single-phase HEC with the MeC chemical formula was formed. The XRD and SEM/EDX results are consistent between themselves. The obtained HEC are characterized by high wear resistance and hardness, with an average value of hardness for carbide sintered at 1400 °C of 1260 HV.