Dislocation structures, and their effect upon super-dislocation motion in single crystals, were studied by using 2-step deformation techniques. Octahedral or cube slip was encouraged by pre-straining. A difference in the induced dislocation structures was found to cause an appreciable change, in the second deformation step, which depended upon the combination of stress axes. The use of high-voltage transmission electron microscopy, and in situ deformation, permitted structural changes due to dislocation to be observed. The electron bombardment also decorated antiphase boundary tubes, and helped to monitor dislocation motion. The usual anomalous strengthening was considered with respect to fine non-planar dislocation structures which were produced by cross-slip and dislocation-dislocation interactions.

In situ Observation of Superdislocation Motion in Pre-Strained Ni3Ge Single Crystals. T.Murakumo, K.Haruta, N.Yoneyama, A.Sato: Journal of Microscopy, 2001, 203[1], 57-67