Abstract
In the case of the f.c.c. structure the free energy for three different kinds of superstructures is calculated. To this purpose a model is developed which enables to investigate the influence of the nearest neighbours on the elastic energy of an atom. The result is examined at a Ni-Pt alloy for which the asymmetries of the phase diagram of the cubic and tetragonal ordered structures are found. An application of this model to dislocations gives an additional term for the elastic interaction of a dislocation with the atoms of the ordered alloy structure as compared to the calculation of an alloy in a state of disorder.
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