It was noted that recent developments in high-resolution transmission electron microscopy had permitted the lattice imaging of defects in alloys. It was shown here how this technique could be used, together with weak-beam studies, to obtain precise information concerning the elementary mechanisms of shear of ' precipitates by matrix dislocations in a Ni-based super-alloy. This revealed the nature and spatial extent of the superlattice stacking faults that might be encountered in this type of composite alloy. With the aid of lattice simulations, the physical nature of the bounding dislocations at the /' interface, as well as the mathematical value of their Burgers vectors, could be found.

B.Décamps, J.M.Pénisson, M.Condat, L.Guétaz, A.J.Morton: Materials Science Forum, 1995, 189-190, 261-6