中文摘要：

以复杂的Warren二元及赝二元常规系统下的液-固界面自由能理论为基础,借助Pb-Al二元体系为例对其进行简化,获得了二元非混溶体系液-固界面自由能物理模型,然后对其热力学公式进行推导,得出只含两个参变量的理论公式,并对几种温度下液-固界面自由能（γSL）计算值及用多相平衡（MPE）法得到的实验值作了对比.结果表明,改进的物理模型及理论公式易于理解、计算简便,γSL的计算值取决于温度及Al原子分数的两个参变量,与实验值较好地吻合,证明了该模型具有结构简单、精度较高的优点,并可作为其它非混溶体系γSL的计算模型,为其推广应用奠定基础.

英文摘要：

Based on the Warren＇s interface theory of liquid-solid interfacial energy for complicated compatible binary and pseudo binary systems,a physical model for the liquid-solid free interfacial energy that has been simplified at the theoretical level was obtained by taking the Pb-Al liquid-solid binary system as an example.A theoretical formula with two variables was then obtained by deducing a thermodynamic equation,and the calculational values and the experimental values by multiphase equilibrium method（MPE） were compared.Finally,research on a Pb-Al binary liquid-solid system showed that the calculated liquid-solid interfacial free energy（γSL） values from the model provided a result similar to the experimental measurement with a low average error.The calculated values only depend on the temperature and the Al concentration.A foundation to calculate γSL for other systems has therefore been established.