Cu-Ni合金组元的偏原子体积与平均原子体积的关系

RELATIONSHIP BETWEEN PARTIAL AND AVERAGE ATOMIC VOLUMES OF COMPONENTS IN Cu-Ni ALLOYS

本文建立了固溶体组元的偏摩尔性质与平均摩尔性质的一般关系式和CC理论中的偏摩尔性质函数；导出了组元的偏摩尔性质与平均摩尔性质的差值方程和差值约束方程，以及Gibbs—Duhem一般式；证明了由CC理论中固溶体平均摩尔性质各组合函数求得的偏摩尔性质是相等的，但在一般情况下，偏摩尔性质不等于组元的平均摩尔性质．以CU-Ni合金和组元的平均原子体积以及组元的偏原子体积的计算为例，证明了这些论述．

General equations of relationship between partial and average molar propertiesof alloy components and functions of partial molar properties in CC theory have been established.The differential equation and its constraining equation between partial and average molar proWerties and general Gibbs--Duhem formula have been derived. It has been proved that the partialmolar properties calculated from various combinative functions of average molar properties areequal, but in general the partial molar properties are not equal to the average molar propertiesof a given component. All equations and functions established in this paper have been provedto be correct by calculations of partial and average atomic volumes of components and averageatomic volumes of the solid solutions in the Cu-Ni system.