Interfacial and Tribological Characteristics of MoS2 on Ni Under Nanoindentation and Nanoscratch

With the rapid development of science and technology, microscale machining has become an important topic, and lubricants play a vital role in machining. Solid lubricants are suitable for a variety of precision machining better than liquid lubricants. Molybdenum disulfide (MoS2) in 2D-layered nanomaterials is a promising candidate for use as a solid lubricant. Herein, molecular dynamics (MD) simulations are performed to study the effects of scratch depth, speed, and temperature on the mechanical properties of Ni-based MoS2 thin films. The results show that atom stacking and extrusion around the abrasive tip increase the friction coefficient in the indentation and scratch phases. The higher value of scratch depths, speeds, and temperatures can lead to higher friction coefficients and wider dislocation distributions. Moreover, Shockley dislocation appears in all cases at all effects, and the total dislocation length increases with the higher value of scratch depths, speeds, and temperatures.

Automated summary

With the rapid development of science and technology, the use of solid lubricants, particularly Molybdenum disulfide (MoS2), in microscale machining has gained significant attention. Molecular dynamics simulations were conducted to investigate the influence of scratch depth, speed, and temperature on the mechanical properties of Ni-based MoS2 thin films. The results revealed that higher scratch depths, speeds, and temperatures led to increased friction coefficients and wider dislocation distributions, with the appearance of Shockley dislocation in all cases.