The structure and motion, via climb, of 1/3<111> twin dislocations along a coherent twin boundary in Al were examined via a combination of high-resolution transmission electron microscopy and computer simulation. The climb of these defects increased the thickness of the twin and was a possible alternative to the more familiar glide mechanism. Detailed analysis of the observed defect structure, and comparison with atomistic modeling, showed that the 1/3<111> twin dislocations existed in a dissociated configuration. This structure could be interpreted as involving the relaxation of the 1/3<111> dislocation into 2 dislocations; a Shockley partial and a stair-rod dislocation which were separated by a short segment of stacking fault.

Structure and Climb of 1/3<111> Twin Dislocations in Aluminium. S.M.Foiles, D.L.Medlin: Materials Science and Engineering A, 2001, 319-321, 102-6