In this work, heat transfer and phase change of an argon crystal irradiated by a picosecond pulsed laser are investigated using molecular dynamics simulations. The result reveals no clear interface when phase change occurs, but a transition region where the crystal structure and the liquid structure co-exist. Superheating is observed during the melting and vaporizing processes. The solid-liquid interface is found to move with a velocity of hundreds of meters per second, and the vapor is ejected from the surface with a vapor front velocity of hundreds of meters per second.

Issue Section:
Technical Papers
Keywords:
molecular dynamics method, heat transfer, laser beam effects, argon, solid-liquid transformations, Ablation, Heat Transfer, Laser, Molecular Dynamics
Topics:
Atoms, Heat transfer, Laser materials, Lasers, Molecular dynamics simulation, Heating, Vapors, Melting, Thermal equilibrium
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