Electronic structure and plasticity anomalies of the intermetallic compound Co3Ti

In order to explain the physical causes of the mechanical anomalies of the intermetallic compound Co₃Ti we theoretically determine the dependence of the stacking-fault energy on the composition. The problem of evaluating that energy for Co₃Ti is reduced to a problem of examining the difference of the specific energies of close-packed disordered phases of Co−Ti alloys in the ground state. The energies are calculated within the framework of a model based on the locator method of the electron theory of alloys. The stacking-fault energy is found to become zero in the direct vicinity of the Co₃Ti composition. The possibility that alloying may have an effective influence on that quantity is demonstrated. The density ofd states and the enthalpy of formation of Co−Ti alloys are calculated. V. D. Kuznetsov Siberian Physicotechnical Institute at Tomsk State University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 14–21, June, 1996.