Microstructure and properties of TiNbZrMo high entropy alloy coating

Abstract A novel refractory high-entropy alloys coating (RHEC) with composition close to TiNbZrMo was synthesized on 316L by laser cladding. The hardness, wear resistance and corrosion resistance of the TiNbZrMo RHEC were tested, the results show that the RHEC as a single-phase solid solution with the body-centered cube (BCC) structure and displays a typical dendritic microstructure. The average microhardness of RHEC is about twice of the 316L substrate. And it also exhibits excellent wear resistance which is illustrated by the low friction coefficient and small mass-loss of the RHEC during friction-wear testing. Electrochemical studies indicated that the corrosion resistance of the RHEC in 3.5 wt% NaCl solution is significantly better than that of 316L stainless steel.