Temperature-induced liquid-liquid transition process in eutectic Pb-Sn melt explored from kinetic viewpoint

Up to now, there have been few studies of the temperature-induced liquid-liquid structure transition ( LLST) kinetics for atomic systems. In this paper, through isothermal and heating experiments, we have investigated the kinetics of the LLST process in Pb - Sn61.9 wt% melt by measuring the electrical resistivity and heat flux. The time evolution of the heat flux and electrical resistivity can be described by the Johnson - Mehl - Avrami model with an Avrami exponent of 3.87, which is an indication of nucleation- growth- type ordering of the nonconserved order parameter. What is more, we have calculated the reaction rate constant K-T and apparent activation energy Delta E, and deduced the reason for the characteristics of temperature- induced LLST. The result of this research could be beneficial for a further understanding of the essence of LLST.