Abstract
Through isothermal experiments, we investigated the time evolution of electrical resistivity of temperature induced liquid-liquid structure transition (LLST) in PbSn liquid alloys with different compositions: hypoeutectic PbSn40 wt%, hypereutectic PbSn80 wt% and eutectic PbSn61.9 wt%. We found that the kinetic transition process is nucleation-growth type, and have different transition models with the change of composition: the Johnson-Mehl-Avrami model at the eutectic point and the autocatalytic reaction model at the hypoeutectic and hypereutectic composition region. The mechanisms of the autocatalysis and the transition kinetics have been roughly discussed. The result of research could be beneficial for further understanding of the essence of LLST.

Key words
liquid structure transition; electrical resistivity; activation energy

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