Surface and interface mechanical properties of inorganic nanolayers

Abstract

This study investigates the effects of the indenter on nickel coated by MoS2 during nanoindentation and nanoscratch through molecular dynamics (MD) simulations. The effects of indenter size, indenter shape, and scratch angle on the deformation and wear mechanisms of the material were studied. The results show that the size and shape of the indenter have significant effects under nanoindentation and scratching. A larger indenter size can lead to a larger deformation zone and more dislocations inside the workpiece, and the friction coefficient also decreases as the radius of the indenter increases. The friction coefficient at different scratch angles is not significant difference, which indicates that in the case of the monolayer of MoS2 coating has weakly dependent on the lattice orientation. In addition, different indenter shapes will cause differences in stress concentration and penetration depth inside the workpiece. The trapezoidal indenter also shows a higher friction coefficient and wear rate.