In order to clarify the flattening process of the high-temperature and high-speed droplet due to its impact on the substrate in an atomic level, a three-dimensional molecular dynamics simulation was conducted. The droplet and the substrate were assumed to consist of pure aluminum, and Morse potential was postulated between a pair of aluminum atoms. By visualizing the analytical result, the processes of melting and solidification, temperature distribution, deformation velocity and potential

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... y of atoms of the droplet were clarified. As a result, following conclusions were obtained : ( 1) The transfer of the droplet atoms to the horizontal direction in flattening process increases in proportion to the horizontal distance from the central axis of the droplet. ( 2 ) The solidification of the droplet starts from the outside edge of the droplet, and finishes as the flattening ratio increases.