Low-angle grain boundaries and their intersections, in melt-textured samples, were studied by means of transmission electron microscopy. The boundaries were found to contain both tilt and twist components, and consisted of dislocation arrays. The boundaries also interacted and, within these regions of interaction, the ab-plane alignment of the grains was maintained by varying the magnitudes and directions of the twist and tilt angles. This was accompanied by changes in the grain boundary plane. These changes appeared to affect the efficient pinning of grain boundary dislocations. The dislocation structures of these grain boundaries were considered with regard to their possible coupling properties. On the basis of this analysis, most of these boundaries were deduced to be strongly coupled. However, short pieces of the boundaries could be weakly coupled.

M.Mironova, G.Du, I.Rusakova, K.Salama: Physica C, 1996, 271[1-2], 15-22