Thermodynamic evaluation and calculation of phase equilibria of the Ti-Mo-C-N quaternary system

A thermodynamic assessment of the Ti-Mo-C-N quaternary system has been made based on the previous assessments of the Ti-C-N and Mo-C-N systems in comb ination with new assessments of the Ti-Mo-C and Ti-Mo-N systems. The parame ters of the thermodynamic models describing the individual phases of the qu aternary system were evaluated from experimental information in the literat ure through a computer-aided optimization technique called the CALPHAD meth od. The thermodynamic parameters were used to calculate phase diagrams and to evaluate thermodynamic stability of the (Ti, Mo)(C, N) phase of the quat ernary system. The calculated results were in good agreement with experimen tal results. (C) 1999 Published by Elsevier Science S.A.