中文摘要：

采用熔化自由能法、标准生成自由能法和化学平衡法推导出利用8种类型的三元相图计算活度的公式,覆盖了三元相图的点、线、面全部范围。公式本身没有引进假设和近似。这8种类型的三元相图涵盖了有液相面各种类型的三元相图。本研究的计算方法和计算公式可以应用于各种复杂的三元相图,该方法也可以推广到三元等温截面相图和三元以上的多元相图。

英文摘要：

The activities formulas of all the points,lines and areas were calculated from the eight typical ternary phase diagrams by means of the melting point free energy method,standard free energy of formation method and chemical equilibrium method.No assumptions and approximations were introduced.The eight typical phase diagrams studied almost cover the whole range of ternary phase diagrams.The calculation methods and formulas could be applied to all kinds of complicated ternary phase diagrams.Additionally,this method could also be widely applied to the ternary isothermal section phase diagrams and multi-component phase diagrams.