Monte Carlo Simulationof the Initial Disordering Rate of Cu_3Au Under Ion Irradition

摘要

The temperature dependence of disordering of Cu_3Au during ion irradiation has been ivnestigated by computer simulations using MONTE CARLO methods. The investigation was motivated by peculiar experimetnal observatiosn that hte initial disordering rate begins to decrease above approx 300 K, which can be explained by vacancies just becoming mobile at that temperature, but then at approx 475 K, it reaches a minimum and then increases rapidly as the temeprature is further increased, up to the order-disorder temperature. The present simulation shows that this behavior can be udnerstood in terms of temperatures dependencies in both atomic mixing in the cascade and the efficiency of vacancy annealing of disorder as the vacancies diffuse out of the cascade.