Multi-phase uniformly distributed γ/γ′ phase interfacial friction mechanism of nickel-based single crystal alloys

The molecular dynamics method was employed to simulate the friction process at the multiphase uniformly distributed γ/γ′ phase interface of a nickel-based single crystal alloy. The results show that the presence of a coherent interface significantly affects friction force fluctuations, abrasion mark morphology, atomic displacement, and material resilience. The coefficient of friction varies with the number of interfaces and is closely related to the depth of wear. Atomic displacements and strains are affected by the lattice interfaces, which affect the propagation of strains. As the number of interfaces increases, the elasticity of the γ′ phase increases, while the elasticity of the γ phase decreases. The number of interfaces also affects the dislocation density and the dislocations due to mismatch. Adequate control of the coherent interfaces is therefore essential to optimize the friction and wear characteristics.