Abstract
Solid-solid and solid-liquid phase equilibrium in the Ni-Ti system is studied within the framework of the cluster variation method (CVM). The energy parameters entering the free-energy description of each phase are determined by tight-binding energy calculations using the cluster Bethe lattice method (CBLM). For simplicity, the pair interactions are restricted to first-nearest neighbours in FCC-based structures and to first- and second-nearest neighbours in BCC-based structures. The configurational entropy for disordered solutions and for ordered compounds are obtained using the tetrahedron approximation of the CVM. The three compounds NiTi, Ni3Ti and NiTi2 compounds are treated as stoichiometric compounds. The calculated diagram agrees reasonably well with that determined experimentally.
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