The weak-beam technique of electron microscopy was used to image the four-fold dissociation of superlattice dislocations in a D03-ordered Fe-26at%Al alloy. Values of 77 and 85mJ/m2, respectively, were obtained for the first and second nearest-neighbor antiphase boundary energies.

Weak-Beam Technique Applied to Superlattice Dislocations in Iron-Aluminum Alloys - 2. Fourfold Dissociation in D03-Type Order. R.C.Crawford, I.L.F.Ray, D.J.H.Cockayne: Philosophical Magazine, 1973, 27[1], 1-7