It was recalled that, in these ordered alloys, a dislocation could dissociate into 4 Shockley partial dislocations, in the (111) plane, which were connected by complex stacking faults and antiphase boundaries with specific widths and energies. It was noted that, when the width of the stacking fault was less than 10 times the width of the antiphase boundary, the classical treatment of dislocation interactions became inaccurate because the treatment of the displacement as a step function was no longer adequate. A treatment that was based upon the Peierls model permitted more realistic values of the stacking-fault energies and antiphase boundary energies to be estimated on the basis of experimentally determined values of the widths.

G.Schoeck: Philosophical Magazine Letters, 1997, 75[1], 7-14