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Phase Diagrams
The Eutectic Diagram

· Alloys may have components with a limited solid state solubility. 
· For the Eutectic phase diagram shown, the components A, B have limited solid state solubility.
· The temperature T2 is the Eutectic Invariant Temperature at which
three phases are in mutual equilibrium. 
· At T2 the Gibbs phase rule at constant pressure for C = 2, P = 3 gives: Fp = 0. 
i.e. Phase compositions are fixed.