The dislocation structure of a typical low-angle boundary, which was associated with a kink band in a sample that had been deformed at room temperature, was studied by means of high-resolution transmission electron microscopy. The boundary had both tilt and twist components. In order to account for both of these, the boundary was assumed to be composed of parallel alternating mixed perfect dislocations with 2 different Burgers vectors; lying in the basal plane at an angle of 120º with respect to one another. The boundary twist was provided by having an excess of one type of dislocation. This hitherto unreported structure of a low-angle boundary was attributed to the fact that all of the dislocations were confined to the basal planes.

High-Resolution Transmission Electron Microscopy Study of a Low-Angle Boundary in Plastically Deformed Ti3SiC2. L.Farber, I.Levin, M.W.Barsoum: Philosophical Magazine Letters, 1999, 79[4], 163-70