中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 22 No. 6 June 2012 |
（1. Key Laboratory for Anisotropy and Texture of Materials of Ministry of Education,
Northeastern University, Shenyang 110819, China;
2. School of Materials Science & Engineering, Tianjin University of Technology, Tianjin 300384, China）
Abstract:The thermodynamic re-assessment of Au-Pt binary system was carried out by using the Calphad method and based on the recent experimental data. The Gibbs energies of face-centred cubic and liquid phases were described by a sub-regular solution model with the Redlich-Kister equation. Much effort was taken to reproduce the phase equilibrium results and thermodynamic properties of the solid phase, including the activity and mixing enthalpy. The constraint of the third law of thermodynamics was also considered in the assessment. According to the presently assessed results, the miscibility gap region in the Au-Pt system slightly shifts to the Au-rich side, and the critical point of the miscibility gap is about 1200 °C and Au-56% Pt.
Key words: Au-Pt system; phase diagram; thermodynamic assessment; Calphad method
