On the stability of the A 15 structure

The pair potential model is applied to problems of thermodynamic stability involving the A 15 structure. Many such problems have been clarified and answered by this procedure. Among the problems considered are the stability of A 15V3Al and Nb3Si; the stability of Nb3(M1, M2) and V3(M1, M2) A 15 pseudobinary stability of stoichiometric A15 phases; long range order of A 15 phases; the effect of pressure on the stability of the A 15 structure; the type of phase diagram that is stable in the vicinity of the A 15 phase.