A consolidated semi-empirical method is presented for calculating the interfacial free energy of dislocation and of coherent interphase boundaries. The broad faces of γ plates in α-Al-Ag and of θ′ plates in α-Al-eu are used as examples of the two types of boundary. New results are reported for the enthalpic and for the positional entropic components of the chemical part of the total interfacial free energy. A result due to Taylor (J. Inst. Metals, 1957–58, 86, 456) is used to show that the total energy, as calculated by present methods, is appreciably too high, and must be scaled down empirically.
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