Modeling Techniques for the Prediction of Phase Diagrams

Abstract

Most metallurgical reactions at high temperatures involve two or more phases. Therefore, the phase diagram, which describe the phase relations based on their therm-odynamic properties are highly important. These diagrams display graphically a large amount of data on the beha-viour of a system in a limited space. The variables that are plotted in most diagrams are temperature and compo-sition. Also the diagrams showing the relations of temp-erature and pressure and several compositions at a given temperature for ternary systems are drawn in many instances. These diagrams are also known as equilibrium diagrams since the phase reactions are considered to be in thermodynamic equilibrium . However, non equilibrium diagrams, such as metastable phase diagrams and coherent phase diagrams are also available for some systems.