Grain Orientation and Dislocation Patterns

Niels Hansen (1) , Xiaoxu Huang (1) , Wolfgang Pantleon (1) , Grethe Winther (1)

1 Materials Research Department

Dislocation patterns have been characterized by transmission electron microscopy and Kikuchi line analysis in pure, polycrystalline aluminium deformed in tension at room temperature in the strain range 0.05-0.34. The angular strain relationship of the dislocation boundaries, their scaling behaviour and the occurrence of similitude shows that two dislocation patterns coexist in all grains, however, with very different characteristics dependent on the grain orientation. An analysis of the hardening behaviour of the grains in the polycrystal and a comparison with single crystal behaviour show a similar strong correlation pointing to the slip pattern as a dominating factor both behind the microstructural evolution and the hardening. An analysis of operating slip systems has underpinned the division of the stereographic triangle based on the microstructural characterization and the hardening behaviour.

Mots clés: Physical Sciences

Niels Hansen, Xiaoxu Huang, Wolfgang Pantleon, Grethe Winther. Grain Orientation and Dislocation Patterns. Philosophical Magazine, 2006, 86 (25-26), pp.3981-3994. ⟨10.1080/14786430600654446⟩. ⟨hal-00513684⟩