Dislocation patterns were characterized by means of transmission electron microscopy and Kikuchi line analysis in pure polycrystalline Al deformed in tension at room temperature in the strain range of 0.05 to 0.34. The angle strain relationship of the dislocation boundaries, their scaling behaviour and the occurrence of similitude showed that 2 dislocation patterns coexisted in all grains, albeit with very different characteristics, depending upon the grain orientation. An analysis of the hardening behaviour of the grains in the polycrystal and a comparison with single-crystal behavior revealed a similarly strong correlation, pointing to the slip pattern as being a dominant factor behind both the microstructural evolution and the hardening. The division of the stereographic triangle representing all possible crystallographic orientations at the tensile axis based upon microstructural characterization and hardening behaviour, was correlated with a division based upon slip-pattern characteristics.

Grain Orientation and Dislocation Patterns. N.Hansen, X.Huang, W.Pantleon, G.Winther: Philosophical Magazine, 2006, 86[25-26], 3981-94