Critical evaluation and thermodynamic modeling of the Al-Co-Fe system

Description

An understanding of the thermodynamic and phase diagram data for the Al-Co-Fe system is essential for Co-based superalloys as well as high entropy alloys. In this study a thermodynamic assessment of the entire Al-Co-Fe system has been made according to the CALPHAD method after a critical review of the relevant literature data. The order-disorder model has been adopted to describe the A1/L12 and A2/B2 phase relations, respectively. Thermodynamic interaction parameters have been optimized, considering the available experimental data, especially about the complex equilibria arising from the interaction between chemical and magnetic ordering in the A2 and B2 phases. Several isothermal and vertical sections have been calculated and discussed in comparison with experimental results in the whole composition range. A satisfactory agreement was obtained.

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