The noteworthy mechanical difference and diverse substrate damage of coatings via molecular dynamics

Abstract

For previous studies have neglected the effect of coating thickness and crystal plane on materials deformation during machining, this work is to investigate how coating thickness affect materials deformation with distinct crystal orientation. Using the nanoindentation technique, the mechanical response and plastic deformation of Cu substrate containing FeNiCrCoCu high-entropy alloy coating are investigated. This work provides direct evidence that coating thickness influences the deformation behavior of the workpiece at the atomic level. The results show that the crystal orientation influenced the change of the load–displacement and the deformation behavior, i.e., the mechanical feedback of different crystal planes to the nanoindentation was different, and even the opposite phenomenon occurred with the increase of coating thickness. The anisotropy of the internal phase transition patter and surface morphology deformation in different crystal planes were analyzed by the crystallographic analysis. The work offer microstructure information support for the effect of material anisotropy, coating thickness, and coating atoms on substrate defect-formation, defect/defect interactions, strengthening mechanisms upon loading.

Keywords

• Nanointendation
• Coating
• Plastic Deformation
• Strengthening mechanisms