Dislocation boundaries in drawn single-crystal copper wires produced by Ohno continuous casting were studied via electron backscattering diffraction and transmission electron microscopy. In the undeformed wires, there were sub-grains with a misorientation angle of less than 4.2°. For the cold-drawn wires, misorientation angle and spatial distribution of dislocation boundaries were measured; analysing the formation mechanism of dislocation boundaries parallel to the drawing direction. Regarding spatial distribution of high-angle dislocation boundaries, at strains of more than 2.77, the boundaries spread from the centre to the surface regions with increasing strain. Regarding the angular distribution of dislocation boundary misorientation, at the strain lower than 2.77, there was one peak lower than 5°. Increasing the strain to 4.12, a bimodal distribution of misorientation angles was observed. One was lower than 5°, and the other was between 45 and 50°. For dislocation boundaries parallel to drawing direction, although at low strains there were different deformation bands with different microstructures, at high strain the microstructures were characterized as dislocation boundaries parallel to drawing direction formed by two approaches: the interaction between two kinds of boundaries and the increase in misorientation angle of boundaries shared by some dislocation cells.

Dislocation Boundaries in Drawn Single Crystal Copper Wires Produced by Ohno Continuous Casting. J.Chen, W.Yan, R.G.Ding, X.H.Fan: Journal of Materials Science, 2009, 44[8], 1909-17