Molecular Dynamics Study of Sliding Mechanisms of Carbon in the Amorphous-Like State
AI Dmitriev and AY Nikonov, MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS-2016), 1785, UNSP 030007 (2016).
In the paper, simulation of the treatment of two crystals with an amorphous interlayer is carried out using the method of molecular dynamics. We study two different configurations, namely, two alpha-Fe crystallites with an amorphous carbon layer between them and two diamond crystallites with an amorphous carbon interlayer. The simulation result has revealed several processes realized in the contact area as a result of shear loading. Depending on the material of the crystal, we observe either sliding along the interface between the crystal and the amorphous layer or deformation inside the amorphous layer. We compare the time dependencies of resistance forces for the studied samples. Both samples with a carbon interlayer show stable mean values of resistance force. In case of a sample with iron crystallites, resistance is very low and there are no oscillations. Thus, an amorphous carbon interlayer can be a solid lubricant with very low friction characteristics.
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