【摘要】 使用计算相图方法（CALPHAD）计算Au-Ag-Al的三元相图时，三个边际二元相图（Au-Al,Au-Ag,Ag-Al）的准确性对三元相图的计算有很大的影响，目前Au-Al边际二元相图存在着一定的矛盾。在综合评估Au-Al体系实验数据的基础上，优化和计算了Au-Al合金体系的平衡相图，使用置换式溶体溶液模型描述Au-Al体系中液相、Bcc和Fcc相的吉布斯自由能，分别用亚点阵模型（Al）（Au）₄、（Al）₃（Au）₈、（Al）（Au）₂、（Al）（Au）和（Al,Au）₂（Al,Au）描述AlAu₄、Al₃Au₈、AlAu₂、AlAu和Al₂Au相，通过Pandat软件优化得到一组各相的热力学参数，计算得到的Au-Al相图与实验数据和热力学数据相吻合。结合Au-Ag和Ag-Al的热力学参数，计算了Au-Ag-Al液相面投影图和等温截面图，液相面投影图显示该三元系存在8个四相平衡反应，对Au-Ag-Al合金的研究具有指导意义。更多还原

【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 Fcc 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（Al,Au）₂（Al,Au） to describe the AlAu₄, Al₃Au₈,AlAu₂, 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 liquidphase 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.更多还原