Abstract
A pair interaction model for describing the thermodynamic activities in binary ordered alloys with substitutional defects (antisite atoms) has been formulated in the framework of the Bragg–Williams approximation, taking the ordering energy as the basic parameter. Analytical expressions have been derived for the thermodynamic factor in chemical diffusion. The thermodynamic factor can readily be calculated using the ordering energy obtained by analysing activity data. As examples, experimental data of the thermodynamic activity in AgMg (B2), NiZn (L1 0) and Ni 3Al (L1 2) have been analysed and the thermodynamic factor vs composition curves are presented.
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