Abstract
The thermodynamic properties of the Mn-V-C system are not known from experiments, and there is a need for information on the stability of the various phases and the Mn-V-C phase diagram. This kind of information has been obtained by us. Our approach combines the methods of phenomenological modeling and extrapolation from the lower-order systems, which have been developed in the so-called CALPHAD (i.e., CALculation of PHAse Diagrams) work, with predictions of unknown thermodynamic quantities. The predictions are based on regularities in bonding properties and vibrational entropy of 3d-transition metal carbides. By using predicted Gibbs energy functions as input information in the Hillert-Staffansson “two-sublattice” phenomenological model, we take into account the substitution of Mn for V in all carbide phases. Our results are summarized in tables of thermodynamic parameters, calculated isothermal sections of the phase diagram, and the liquidus surface.
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