Thermodynamic assessment of the Pt–Ti system

The thermodynamic properties and phase diagram of the Pt–Ti system have been analyzed by the CALPHAD technique using a computational optimization procedure. Based on the experimental data, the solution phases (liquid, body-centered cubic (Ti), face-centered cubic (Pt) and hexagonal close-packed (Ti)) were modeled with the Redlich–Kister equation. The compounds Ti3Pt, αTiPt, βTiPt and γ, with a homogeneity range, were treated as sublattice-compound energy model, respectively. The compounds, Ti4Pt3 and TiPt8 were treated as stoichiometric phases. The parameters of the Gibbs energy expressions were optimized according to all the available experimental information of both the equilibrium data and the thermodynamic results. A set of self-consistent thermodynamic parameters of the Pt–Ti system have been obtained. The calculations agree well with the respective experimental data.