6. Various types of binary diagrams in relation to the nature of interactions w

6.1 Weakly interacting systems with total solid miscibility

Figure 4 shows a simple system where the two components are miscible in all proportions in both the liquid phase L and the solid solution α. Only two phases occupy the equilibrium diagram. At high temperatures, the L phase and, at low temperatures, the α phase. Isomorphic pure bodies A* and B* melt at 900 and 700°C respectively. Between these two temperatures, the diagram shows two conjugate liquid and solid lines called liquidus and solidus forming a spindle of phase coexistence that closes at the ends of the diagram on the two melting points of the pure bodies. The two regular interactions are...