Temperature–composition dependence of thermodynamic mixing functions of liquid alloys of copper with rare-earth metals

Abstract

The composition and temperature dependences of thermodynamic functions of mixing in liquid alloys of copper with rare-earth metals and their variation in the series are considered. It is shown for majority of systems in the series that the most intensive interaction between components is observed in the composition range enriched with copper. The negative deviations of thermodynamic properties of mixing increase with decreasing temperature. The main features of the temperature–composition dependence are explained under the assumption that chemical short-range ordering like a chemical compound forms in the Cu–REM liquid alloys. The temperature–composition dependence of thermodynamic functions of mixing is described in the framework of the ideal associated solution model.