Phase diagrams of ternary systems

This chapter addresses how the behaviour of a system with three components is represented using a triangular phase diagram and how such diagrams are interpreted. Ternary phase diagrams are widely used in metallurgy and materials science. At a fixed temperature and pressure, the phase diagram of a ternary system is conveniently represented using a triangular graph. In a ternary system, the tie lines in the two-phase region are constructed experimentally by determining the compositions of the two phases that are in equilibrium, marking them on the diagram, and then joining them with a straight line. The chapter then looks at partially miscible liquids and ternary solids.