Thermodynamic Modeling of the Al-Co-Pd Ternary System, Aluminum Rich Corner

The aluminum-rich corner of the Al-Co-Pd ternary system was thermodynamically modeled by the CALPHAD method in the present study. The ternary system is a complex system with many ternary phases (W, V, F, U, Y2, C2). All ternary phases, except phase U, were modeled as stoichiometric compounds. The order-disorder model was used to describe the BCC-B2 and BCC-A2 phases. Solubility of the third element in binary intermetallic phases (Al5Co2, Al3Co, Al9Co2, Al13Co4, Al3Pd and Al3Pd2) was modeled. The experimental results collected from the literature were used in the optimization of the thermodynamic parameters. A good agreement between the experimental results and the calculations was achieved.

Automated summary

The aluminum-rich corner of the Al-Co-Pd ternary system was thermodynamically modeled using the CALPHAD method in this study. Different ternary phases were described using the order-disorder model, and the solubility of the third element in binary intermetallic phases was also modeled. The experimental results were used to optimize the thermodynamic parameters, resulting in good agreement between the experimental and calculated results.