Abstract
The influence of pair and multiatom interactions on ordering and stability energies and on chemical short range order in binary substitutional transition metal alloys has been investigated in the framework of the generalized perturbation method; this latter enables to compute the cluster interactions from the electronic structure. Using the configurational energy, expressed in terms of two and three body irreducible interactions, it is shown that except in some very peculiar cases, the multiatom interactions play a minor role, both for order and stability of ordered structures built on the fcc lattice. The pair approximation is therefore valid in general provided the concentration dependence of the pair interactions is taken into account; as an example, the results obtained for the V-Rh system are reported.
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