In the FeAl alloy; the electronic structures of (110) and (121) antiphase b
oundaries (APBs) and the effect of Cr on them are calculated using the recu
rsion method. The density of states, the interaction energy between the ato
ms, and the energy of APBs are presented On the basis of these results, the
effects of Cr and APE on the physical properties of the FeAl alloy-are dis
cussed.