Thermodynamics optimization of the Be-Cr binary system

Based on experimental phase diagram data in literatures, thermodynamic assessment on the Be-Cr system was carried out using the Calphad method. Liquid and terminal solution phases in the Be-Cr system were described with the substitutional solution model, and the thermodynamic functions of stoichiometric intermediate compounds CrBe₂ and CrBe₁₂ were explained by the Neumann-Kopp rule. Thermodynamic parameters obtained by optimization were used to calculate the phase diagram of the Be-Cr system and the result shows a reasonable fit to the accepted experimental data. The enthalpies of formation for CrBe₂ and CrBe₁₂ intermediate compounds were also calculated by the Miedema model, and the obtained data are well consistent with those calculated using the thermodynamic parameters.