Molecular dynamics simulation of crystal growth of undercooled liquid Co

Molecular dynamics simulations have been performed to explore the movement of liquid solid interface of Co first by using a potential of embedded atom type. By determining the time dependence of the volume per particle for different temperatures, the simulated melting temperature of 1720 K, is in quantitative agreement with the experiment one. The calculated kinetic growth coefficient agrees well with the latest experimental result. The anisotropy of kinetic growth coefficient is given by k(100) > k(110) > k(111). The activation energy is almost close to zero under high undercoolings, although the crystal growth still proceeds with the speed of about 60 m/s, indicating an athermal process. (C) 2013 Elsevier B.V. All rights reserved.