Phase equilibria and thermodynamics of binary copper systems with 3d-metals.: IV.: Copper -: Manganese system

Thermodynamic properties of alloys and phase diagram of Cu - Mn system have been assessed in the spirit Of the CALPHAD-approach using simultaneously data about thermodynamic properties of phases and their equilibria. Thermodynamic data are known only for liquid and (Cu gamma Mn)-phase, model parameters for (,delta Mn)- and (,beta Mn)-phases were therefore estimated using phase equilibria data. the excess Gibbs free energy of phases is described by models with Redlich-Kister polynomials. The models of Gibbs fi-ee energy of liquid and (Cu, gamma Mn)-phase take into account excess heat capacity of these phases. Thermodynamic model of the system provides a self-consistent description of all thermodynamic values and phase equilibria, including metastable immiscibility of (Cu, gamma Mn)-phase in close agreement with experimental data. Low-temperature part of the diagram is added in accordance with published data on ordering reactions in (Cit, gamma Mn)-phase.