PAIR INTERCHANGE ENERGIES AND THEIR STRUCTURE DEPENDENCE IN Cu-Zn

Abstract
The enthalpy of the order disorder transition for face centered Cu-Zn has been deduced. Although the long range ordered α phase is not stable, it can be obtained by a sequence of stress induced martensitic transformations, starting from the ordered β' phase. It is shown that the results are compatible with the hypothesis that the heat of formation of the disordered and ordered fcc and bcc phases with respect to the pure metals of the same structure consist only of a configurational contribution and that the first neighbor interchange energy is independent of structure for fcc and bcc.