Microstructure, mechanical and tribological behavior of CrHfNbTaTiCxNy high-entropy carbonitride coatings prepared by double glow plasma alloy

Abstract

A series of CrHfNbTaTiCxNy high-entropy carbonitride coatings were prepared as protective hard coatings for Ti60, aiming to solve the problems of high density and poor wear resistant of high-entropy alloy coatings. The coatings were deposited by double glow plasma metallurgy alloy and the microstructure, mechanical and tribological properties were detected. The XRD analysis exhibited that all the coatings show a single NaCl-type structure. The CrHfNbTaTiCxNy coating with a content of 34 at.% C and 10 at.% exhibited relatively excellent wear resistant and low wear rate at different temperature (RT, 300 °C and 500 °C), although the CrHfNbTaTiC have the highest hardness. It can be attributed to the CrHfNbTaTiC0.34N0.1 coating have excellent toughness, plastic deformation resistance, as well as the formation of dense and stable tribo-layer on wear surface during friction, and the wear rate reduce 40.6% compared with 300 °C and 57.3% compared with the CrHfNbTaTiC coating at 500 °C. Accordingly, the main wear mechanism transfer from abrasion wear (at 300 °C) to adhesion wear.