Systematical Calculation of the Chemical Driving Force for Precipitation Reactions in binary Alloys

摘要

The universially accepted equation for the calculation of the chemical driving force from the activities of the com- ponents is taken as the starting point for a systematical cal- culation of the change in chemical free energy of a precip- itation reaction. Equations frequently used in the literature are developed with the aid of the power series by Margules. By the application of model concepts to the entropy and Enthalpy of mixing it is shown that the new method of Calculation results in reasonable values for the driving Force if the concentration dependence of the molar volume Of the components is taken into account.