Abstract
Based on the available experimental data of phase equilibria and thermodynamic properties from the literatures, the Co–Ho binary system has been thermodynamically assessed using the CALPHAD method. The solution phases, Liquid, FCC_A1, BCC_A2 and HCP_A3, were modeled as substitutional solution phases, of which the excess Gibbs energies were formulated with Redlich–Kister polynomial. Meanwhile, all intermetallic compounds were described as stoichiometric compounds. Subsequently, a set of self-consistent thermodynamic parameters describing various phases in this binary system has been obtained. The calculated results can reproduce well the corresponding experimental data.
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