Twinning dislocations in {10•2} twin boundaries were studied by means of high-resolution transmission electron microscopy and atomistic modelling. Image contrast simulations led to an excellent agreement between experimental observations and theoretical predictions. The Burgers vectors of the defects were shown to be b = 0.069 [¯10•1], by circuit-mapping, and were found to be consistent with topological theory. A step of height 2d(10•2) was found to be associated with the defect. Twinning dislocations were also investigated by using computer simulations, and excellent agreement was found between experimental and theoretical studies. In particular, the core of this dislocation in Zn was localized.

T.Braisaz, D.J.Bacon, G.Nouet, R.C.Pond, P.Ruterana, A.Serra: Materials Science Forum, 1996, 207-209, 113-6