The solid-to-liquid transformation in the eutectic system is more complex than the melting process in the ideal-solution phase diagram discussed in connection with Fig. 8.3. In Fig. 8.10, suppose the system starts at temperature T1 with a mole fraction B a bit greater than the terminal solubility at o. The initial state is in the a+P two-phase region. Upon increasing the temperature holding the overall composition constant, the P phase disappears when the terminal solubility curve is reached at point m. Further temperature increase moves the system through the single-phase a region without phase changes until point e is reached. Here the first liquid with composition at point f appears. Additional heatup moves the system through the two-phase a+L region, with the composition of the a phase decreasing from e to c and the liquid phase composition moving from f to d.
Complete liquefaction occurs when the liquidus adfk is reached. For a two-phase mixture with overall B mole fraction corresponding to point k, heatup from Ti would result in complete melting at the eutectic temperature T3.
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