A theory of the order-disorder transformation is developed incomplete generality. The general theory is used to calculate longrange order parameters, short range order parameters, energy, andphase diagrams for a face centered cubic binary alloy. The theoreticalresults are compared to the experimental determination of the copper-goldsystem, Values for the two adjustable parameters are obtained.
An explanation for the behavior of magnetic alloys is developed,Curie temperatures and magnetic moments of the first transition serieselements and their alloys in both the ordered and disordered states arepredicted. Experimental agreement is excellent in most cases. It ispredicted that the state of order can effect the magnetic properties ofan alloy to a considerable extent in alloys such as Ni3Mn. The valuesof the adjustable parameter used to fix the level of the Curie temperature,and the adjustable parameter that expresses the effect of ordering on theCurie temperature are obtained.
