Investigation on the phase separation in undercooled Cu-Fe melts

► Liquid-phase separation was influenced by the gravity difference and the interfacial energy of the separated phases. ► The Stokes motion velocity increased with the undercooling, but the Marangoni motion velocity was slightly affected. ► At the beginning of the liquid-phase separation, the droplets of minor phase were controlled by Marangoni motion. ► As the droplets radius increased, the effect of Stokes motion strengthened and play an dominate role finally.