Abstract
In recent years, high entropy alloy (HEA) nitrides have shown outstanding properties in the field of protective hard coatings. However, for monolayer HEA nitride thin film, low adhesion strength and high residual stress lead to poor anti-wearing capabilities. This study aims at investigating the effect of metallic layer thickness in superelastic Ni51.3Ti48.7 on adhesion strength and wear resistance of HEA (Cr0.35Al0.25Nb0.12Si0.08V0.20) nitride coating. The results showed that the high compressive residual stress of top nitride layer was relieved by introducing NiTi metallic layer. The adhesion strength, wear track morphology and surface fracture were associated with the metallic layer thickness. Adding a proper thickness of NiTi metallic layer can improve the wear resistance of HEA nitride coating. Nevertheless, it was also observed that if the metallic layer thickness was not well controlled, the wear resistance enhancement was insignificant. The findings of this study are suggestive to provide a feasible approach for fabricating anti-wearing HEA nitride coatings.
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