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Figure 3.8.14 Derivation of a phase diagram from the temperature change of free-energy curves of a liquid and two solid phases.

By now you will be able to construct and interpret the phase diagram in Fig. 3.8.15 on a similar basis. This situation arises mainly when the melting points of pure A and B differ considerably and the solid phase is inhomogeneous, so that the “hump” changes dramatically with T. Diagrams of this type are classified as belonging to the peritectic type; the temperature TP is the peritectic temperature; above it no solid a2 phase is formed for any composition; below it there is a wide composition range over which the homogeneous ...

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