MOLECULAR DYNAMICS SIMULATION OF HEAT TRANSFER AND PHASE CHANGE DURING LASER MATERIAL INTERACTION

摘要

In this work, heat transfer and phase change of an argon crystal illuminated with 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 between the solid and the liquid. Superheating is observed during the melting process. The solid-liquid and liquid-vapor interfaces are found to move with a velocity of hundreds of meters per second. In addition, the vapor is found to be ejected from the surface with a velocity close to a thousand meters per second.