The nature of such defects in a quaternary alloy was investigated by using diffraction contrast analysis, in a transmission electron microscope, and Z-contrast electron microscopy. The diffraction analysis confirmed that the fringe contrast which was observed was due to complex planar faults on {100} planes, with ½<100> displacement vectors lying in the fault plane. This conclusion was verified by direct observation of the faults, using Z-contrast microscopy. In addition to the ½<100> in-plane shift, there was also an Al layer missing at the fault. These complex faults also exhibited antiphase-boundary contrast when examined by using a superlattice reflection.

{001} Faults in B2 Fe-40at%Al-0.7at%C-0.5at%B L.Pang, M.F.Chisholm, K.S.Kumar: Philosophical Magazine Letters, 1998, 78[5], 349-55