Thermodynamic assessment of the Nb-Ti system

The thermodynamic properties of the Nb-Ti system have been evaluated by using a regular solution model to describe the Gibbs energies of various phases including both equilibrium and metastable phases. A set of thermodynamic parameters more consistent with most of the selected experimental data than previous assessments has been obtained. Stable and metastable phase equilibria, T(0) loci, metastable chemical spinodal curve of beta phase and thermodynamic properties are calculated with the optimized parameters. With the thermodynamic parameters obtained in this work, authors discuss the possible occurrence range of omega phase.