Abstract:A thermodynamic assessment of the Cu-Cd system has been carried out by CALPHAD technique. The liquid phase, FCC_A1(Cu) and HCP_A3(Cd) terminal phases are described by a simple substitutional model, their excess Gibbs energy is formulated with the Redlich-Kister expression. The system contains four intermediate compounds, including β(Cu₂Cd), γ(Cu₄Cd₃), δ(Cu₅Cd₈) and ε(Cu₃Cd₁₀). The δ phase is described by a two-sublattice model and the other three intermediate phases are treated as stoichiometric phases. The optimization is carried out in the Thermo-Calc package. A set of self-consistent thermodynamic parameters are obtained. The calculated phase diagram and thermodynamic properties agree well with the available experimental data.

Key words: Cu-Cd; phase diagram; thermodynamic assessment