A systematic study of the deformation microstructures over 3 perpendicular surfaces was carried out in the present work in order to correlate better the sub-structure with slip patterns, initial and final crystal orientation, and the macroscopic coordinate system. The microstructure and texture evolution of high purity Al-0.3wt%Mn alloy of initial near brass {110}<112> (or Bs) orientation, channel-die compressed to the strain level of 1.5, were studied by transmission electron microscopy (including transmission electron microscopic orientation mapping) and high-resolution FEG-SEM/EBSD techniques to observe crystal subdivision deformation patterns at the microscopic scale. The grain orientation dependent structures were analyzed in terms of active slip systems focussing on the crystallography of extended planar boundaries. It was concluded that the type of dislocation structure (one or two sets of microbands) in {110}<112> oriented crystallites, at moderate strains (<1.5) depended strongly on the crystallographic grain orientation. In this non-ideal initial crystal orientation the applied deformation mode activates a double slip, of which one system predominates and leads to further rotation away from Bs. A general rotation combined with a wide orientation spread was observed after a strain up to 1.5. The microband boundary alignment corresponds very well to the traces of crystallographic {111} planes, on which most of the slip occurs.

Application of Orientation Imaging to the Study of Substructural Development in Cold Deformed Al-0.3%Mn Single Crystal of {110}<112> Orientation. H.Paul, C.Maurice, J.H.Driver, M.Miszczyk: IOP Conference Series - Materials Science and Engineering, 2010, 7[1], 012024