Thermodynamic assessment of the Co-Ho binary system

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. (C) 2008 Elsevier B.V. All rights reserved.