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利用Pandat相平衡热力学计算软件优化和计算了Ir-Pt二元相图。采用SGTE(Science Group Thermodata Europe)数据库中的表达式描述纯组元(Ir和Pt)的Gibbs自由能,采用固溶体相热力学模型描述Ir-Pt二元体系中的液相和固溶体相。利用Pandat中的PanOptimizer优化平台,并结合最新的相关数据,对Ir-Pt二元体系中各相的参数进行了优化,优化得到了Ir-Pt二元体系中各相的热力学参数。利用优化的热力学参数对Ir-Pt二元合金相图进行了计算,计算得到的相图表明调幅分解的临界点为995℃、50%Ir(摩尔分数)左右,与SGTE贵金属合金数据库所提出的Ir-Pt二元体系在相图和热力学数据上都较为吻合。
The binary phase diagram of Ir-Pt was optimized and calculated using Pandat phase equilibrium thermodynamic calculation software. The Gibbs free energies of the pure components (Ir and Pt) are described by the expressions in the SGTE (Science Group Thermodata Europe) database, and the liquid and solid solution phases in the Ir-Pt binary system are described using the solid solution phase thermodynamic model. Using the PanOptimizer optimization platform in Pandat and the latest relevant data, the parameters of each phase in the Ir-Pt binary system were optimized and the thermodynamic parameters of each phase in the Ir-Pt binary system were optimized. The phase diagram of Ir-Pt binary alloy was calculated by using the optimized thermodynamic parameters. The calculated phase diagram showed that the critical point of amplitude modulation decomposition was about 995 ℃ and about 50% Ir (molar fraction). Compared with the SGTE precious metal alloy database Ir-Pt binary system in the phase diagram and thermodynamic data are more consistent.