Straining experiments were carried out  in situ  on polycrystalline material with the aim of analyzing the mechanisms which controlled dislocation motion. A study was made of the glide of 1/3<11•0> dislocations on prismatic and basal planes. Antiphase boundary energies were also measured for these planes. Two different antiphase boundary energies and 2 different frictional forces were observed on parallel prismatic planes. These were suggested to correspond to 2 different cutting planes. The high Peierls-type frictional forces which were observed on the basal plane, and on one type of prismatic plane, were shown to originate from non-planar dislocation cores. This result was in agreement with recent atomistic calculations.

M.Legros, A.Couret, D.Caillard: Philosophical Magazine A, 1996, 73[1], 61-80