Pb-Al二元体系液-固界面自由能的热力学理论计算  

Thermal Theoretical Calculation of the Liquid-Solid Interfacial Free Energy in Pb-Al Binary System

作　　者：周生刚[1,2] 竺培显[1] 黄文芳[1] 杨秀琴[1] 许健[1] 

机构地区：[1]昆明理工大学材料与冶金工程学院,昆明650093 [2]云南省新材料制备与加工重点实验室,昆明650093

出　　处：《物理化学学报》2009年第11期2177-2180,共4页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(50664005);国家高技术研究发展计划(863)(2009AA03Z512)资助项目~~

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.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.

关 键 词：非混溶 Pb-Al二元体系 Warren理论 多项平衡法 液-固界面自由能 

分 类 号：O642.42[理学—物理化学]