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- Title
Thermodynamic optimization and calculation of the phase diagrams of Au-Ag-Al system.
- Authors
DENG Lichuan; WANG Xiaoqi; ZHOU Xiaolong; YU Jie; LIU Manmen; WANG Lihui
- Abstract
When the calculation of phase diagram (CALPHAD) method is applied to the Au-Ag-Al ternary phase diagram, the accuracy of three marginal binary phase diagrams (Au-Al, Au-Ag, Ag-Al) has a great impact on the calculating results. At present, there are some contraditions in the Au-Al marginal binary phase diagram. Therefore, based on a comprehensive evaluation of experimental data for the Au-Al system, the equilibrium phase diagrams were optimised and calculated by using a solid solution model to describe the Gibbs free energy of the liquid, Bcc and Fee phases in the Au-Al system, and by using the sublattice models (Al)(Au)4, (Al)3(Au)8, (Al)(Au)2, (Al)(Au) and (A1,AU)2(A1,AU) to describe the A1AU4, Al3Au8, A1AU2, AlAu and AL2Au phases. A set of reasonably self-consistent thermodynamic parameters was obtained via optimizing with Pandat software. Au-Al phase diagrams calculated in this way agreed well with the experimental and thermodynamic data. Combined with thermodynamic parameters of Au-Ag and Ag-Al, the Au-Ag-Al liquid-phase, surface projections and isothermal cross-sections were calculated. The liquid- phase surface projections revealed the existence of eight four-phase equilibrium reactions in this ternary system, and these results may be helpful in studying the Au-Ag-Al alloys.
- Subjects
TERNARY phase diagrams; PHASE diagrams; GIBBS' free energy; PHASE equilibrium; EQUILIBRIUM reactions; TERNARY system
- Publication
Precious Metals / Guijinshu, 2024, Vol 45, Issue 2, p11
- ISSN
1004-0676
- Publication type
Article