Atomic-scale analysis of mechanical and wear properties of FeNiCoCuPd high-entropy alloys coating on Cu substrate

Tóm tắt

This study investigates the influence of an FeNiCoCuPd high-entropy alloy (HEA) coating on a copper substrate under scratch conditions. The results demonstrate that the HEA coating significantly enhances the surface mechanical properties of the substrate. The interface between the coating and the substrate acts as an effective barrier, confining phase transformations. The generation and propagation of dislocations primarily within the HEA coating layer. Furthermore, an increase in coating thickness leads to a reduction in the coefficient of friction. The coating layer effectively bears the majority of the applied stress and plastic deformation, impeding the extensive propagation of stress and dislocations into the substrate, thereby mitigating significant damage. The enhanced protective effect observed with increasing coating thickness, correlated with higher applied forces and a larger stressed volume within the coating, underscores the crucial role of such thin film coatings in improving the surface hardness and wear resistance of metallic substrates.