High-angle convergent-beam electron diffraction techniques were used to analyze secondary dislocations in  = 3 and  = 9 grain boundaries. By selecting reflections from crystal planes which were common to the adjoining grains, the images were caused to be insensitive to the boundaries; except when dislocations were present. The dislocation images were very similar to those for dislocations in monocrystals and could be analyzed by using the Cherns-Preston rules. It was shown that, for both boundaries, sufficient reflections could be obtained to permit a complete analysis to be made. Dislocations could then be analyzed by assuming integer values of g•b; thus implying that the Burgers vectors were DSC lattice vectors. For both types of boundary, dislocations were identified that were specific to those boundaries.

J.P.Morniroli, D.Cherns: Ultramicroscopy, 1996, 62[1-2], 53-63