Phase Diagram

PHASE DIAGRAM

Phase diagram is a graph obtained by plotting one degree of freedom against another.

1. Types of Phase Diagrams

1. P - T diagram

If the phase diagram is . plotted between temperature against pressure, the diagram is called P - T diagram. P - T diagram is used for one component system.

2. T - C diagram

If the phase diagram is drawn between temperature against composition, the diagram is called T - C diagram. T - C diagram is used for two component system.

2. Uses of Phase Diagram

1. It is possible to predict from the phase diagrams whether an eutectic alloy or a solid solution is formed on cooling a homogeneous liquid containing mixture of two metals.

2. The phase diagrams are useful in understanding the properties of materials in the heterogeneous equilibrium system.

3. The study of low melting eutectic alloys, used in soldering, can be carried out using phase diagrams.