冷喷涂Au纳米粒子在金属表面沉积过程的分子动力学模拟

MOLECULAR DYNAMICS SIMULATION OF Au NANO-SCALE PARTICLE DEPOSITED ON Au SURFACE DURING COLD SPRAYING

通过对Au纳米粒子在Au基体上沉积过程的分子动力学模拟,再现了冷喷涂中Au纳米粒子在Au基体上沉积的过程以及粒子和基体表层的形貌变化;在撞击过程中,基体的局部区域有熔化现象,通过计算粒子原子进入基体表面层的数量及粒子与基体间的最终接触面积,探讨了影响喷涂粒子沉积过程的主要因素．

By using molecular dynamics simulation, the deposition process of cold spraying nano-scale Au particles on Au （001） surface and the morphological changes of the surface layers of the substrate and the particle are described, in which the many-body potential was used to calcu- late the interatomic force between the atoms. Calculation of the temperatures showed that the melt phenomenon occured on the local area of the substrate during impact and deposition. The influence factors on deposition process, such as incident velocity and the size of the particles, were discussed through calculating the number of atoms penetrating into the substrate and the contact area between the particle and the substrate.