Enhanced Frictional Properties of Alcocrfeniti High Entropy Alloy Coatings Via In-Situ Synthesized Tic

Abstract

In-situ synthesized TiC reinforced AlCoCrFeNiTiCx (x=0.0, 0.5, 1.0, 1.5, 2, 2.5 wt%) HEA composite coatings were fabricated on H13 steel surface by laser cladding. The influence of C (graphite) addition on the phase composition and microstructure of the composite coatings were investigated. Results indicate that the coating consists of body-centered cubic phases and face-centered cubic, while a few in-situ generation of TiC phase after doping C. Microhardness and wear resistance tests analysis show that the coating with 1.0 wt% of C addition exhibits the best performance. The wear mechanism at room temperature and high-temperature is mainly composed of abrasive wear and oxidative wear. In-situ generated TiC phase strengthening was the main reason for the improvement of hardness and wear resistance.

Keywords: High entropy alloys, Microstructure, in-situ TiC, Wear properties