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采用嵌入原子势分子动力学模拟方法,研究了金属铝表面沟槽在冲击下形成微射流的微观过程和动力学性质.通过对模拟结果的统计分析,获得了较宽冲击压力范围内微射流形态的变化规律,以及相应的质量-空间分布和质量-速度分布变化.基于原子中心对称参数,分析了样品近表面非晶态转变和卸载熔化过程,获得了卸载熔化对微射流质量及其分布的影响规律.研究还发现:样品熔化之前,微射流质量与波后粒子速度呈线性增加关系;卸载熔化出现后,微射流质量开始迅速增加;当卸载熔化速度足够快时,金属强度效应可忽略,此时微射流质量与波后粒子速度再次表现出线性增加关系.
The microscopic process and dynamic properties of micro-jet formed by the metal surface groove under impact were studied by the method of embedded atomic potential molecular dynamics simulation.According to the statistical analysis of the simulation results, the micro-jet flow pattern in the wide impact pressure range And the change of mass-space distribution and mass-velocity distribution of the micro-jet are analyzed based on the symmetry parameters of the center of the atom. The near-surface amorphous transition and unloading melting process of the sample are analyzed. The results also show that the mass of micro-jet increases linearly with the particle velocity before it melts, the mass of micro-jet begins to increase rapidly after unloading and melting occurs, and the effect of metal intensity can be ignored when the unloading melting speed is fast enough, At this time, the quality of the micro-jet and the particle velocity after wave again showed a linear increase.