The antiphase domain structure in Ni3Al ordered intermetallics with perfect L12 superstructure was examined. Transmission electron microscopy investigations were performed. Conventional transmission electron microscopy, convergent-beam electron diffraction and high-resolution electron microscopy were used to elucidate the structure of the alloys. For advanced studies of the nature of antiphase boundaries, the large-angle convergent-beam electron diffraction method was employed. The recognition between symmetry-related and displacive domains could be performed with high accuracy using large-angle convergent-beam electron diffraction and dark-field images, even for nanosized domains.

Antiphase Boundaries in Ni3Al Ordered Intermetallic - Application of the CBED Method. Jezierska, E., Morniroli, J.P.: Materials Chemistry and Physics, 2003, 81[2-3], 443-7