EFFECT OF COATING THICKNESS ON MECHANICAL BEHAVIOR AND MICROSTRUCTURE OF CuCrCoFeNi COATING ON Cu CRYSTALLINE SUBSTRATE

Abstract

This study uses molecular dynamics simulations to explore the mechanical behavior of high-entropy alloy CuCrCoFeNi coatings on Cu crystalline substrates during nano scratching, with a focus on detailed analysis of the micro-deformation mechanisms and the influence of coating thickness on the mechanical properties. Through simulations performed on samples with coating thicknesses ranging from 10 Å to 30 Å, significant variations in the mechanical parameters were observed: the average tangential force and normal force increased with the coating thickness, while the friction coefficient decreased markedly at thicker coatings. Notably, the maximum pile-up height in the deformation zone decreased with increasing thickness, reflecting a significantly improved resistance to surface deformation. In-depth analysis of the stacking fault distribution, dislocations, shear strain, and post-scratching surface morphology provided insights into the deformation mechanisms at the atomic scale. These results not only elucidate the mechanical properties of the high entropy alloy CuCrCoFeNi but also confirm the outstanding potential of this material in engineering applications requiring high wear resistance and mechanical strength.