The alignment of sub-structures, formed in Al–0.13%Mg by rolling deformation, was investigated by using electron back-scattered diffraction. The sub-structure of this material was defined by walls of high dislocation content, which could be imaged as low-angle boundaries. Trace distributions of the boundaries were calculated by using a local Radon-transform image-processing method and the boundary normal distribution was estimated using data from various sections. There was no evidence of alignment of the sub-structural boundaries with slip planes or any other simple crystallographic element. It seemed that the sub-structure was oriented mainly with respect to the macroscopic or mesoscopic straining state.

An Objective Study of Substructural Boundary Alignment in Aluminium. P.J.Hurley, P.S.Bate, F.J.Humphreys: Acta Materialia, 2003, 51[16], 4737-50