It was suggested that, if the elastic relaxation effect of an inclined dislocation at both free surfaces of a thin plate was taken into account, the determination of its Burgers vector b in two-beam transmission electron microscopy could be obtained with a notable reduction of experimental work. The relaxation effect produces in general an asymmetric aspect of the lobe contrasts, with respect to a medium line perpendicular to the dislocation image segment. Indeed, from a re-examination of about twenty micrographs of dislocations located in two different materials, it was concluded that a single experimental image was often sufficient to derive b. In no case three experimental images obtained with non-coplanar diffracting vectors were found necessary to obtain unambiguously b.

The Asymmetry of the Lobe Contrasts in Two-Beam TEM as a Test to Obtain the Burgers Vector of an Inclined Relaxing Dislocation. C.H.Belgacem, A.Ati, R.Bonnet: Physica Status Solidi B, 2005, 242[3], R24-6