Abstract
The phase diagram of the Au–Zn binary system may play an important role in developing new Au-base solders. In this paper, the Au–Zn binary system has been thermodynamically assessed with the CALPHAD method. Excess Gibbs energies of solution phases, liquid, fcc, hcp, and ϵ were formulated with the Redlich–Kister expression, while the intermediate phases were modeled with (Au,Zn) 0.5:(Au,Zn) 0.5 for β′, (Au) 0.6:(Au,Zn) 0.2:(Zn) 0.2 for α 1, (Au) 0.64286:(Au,Zn) 0.25:(Zn) 0.10714 for α 3, (Au,Zn) 0.15385:(Au) 0.15385: (Au,Zn) 0.23077:(Zn) 0.46153 for γ, and (Au) 0.12:(Au,Zn) 0.16:(Zn) 0.72 for γ 3, and the other phases including α 2, ϵ′, Au 5Zn 3, γ 2 and δ were treated as stoichiometric compounds according to their composition ranges. Based on the reported thermodynamic properties and phase boundary data, the thermodynamic parameters of these phases were optimized, which give a reasonable agreement between thermodynamic properties and phase diagram.
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