Thermodynamic modeling of the Ru-Ti system

The Ru-Ti system was critically assessed by means of the CALPHAD technique. Based on the experimental data, the solution phases (liquid, body-centered cubic, hexagonal close-packed) were modeled with the Redlich-Kister equation and Kaptay equation. A two-sublattice model (Ru, Ti)0.5(Ru, Ti)0.5 is applied to describe the compound RuTi in order to deal with the order-disorder transition between body-centered cubic solution (A2) and RuTi with CsCl-type structure (B2). Two sets of self-consistent thermodynamic parameters of the Ru-Ti system were obtained.