Antiphase boundary energies in ordered f.c.c. alloys

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Abstract
The energy of mechanically produced antiphase boundaries (APB) in L12, and L10, ordered f.c.c. alloys is calculated, taking atomic interactions up to the fourth nearest neighbours and the required high-order correlations into account. The APB energies are expressed in terms of correlation functions which considerably simplify the treatment. Long range and short range ordered states are treated. The results are applied to Ni3Fe. For this alloy two sets of energy parameters are available: one set derived from electron theory giving the energy parameters up to the fourth nearest neighbours for the completely long range ordered state; and a second set derived from experimental data but limited to the second nearest neighbours. The APB energy is calculated with both sets and compared with recent experimental data.