High pressure torsion applied to nickel single crystals

Reinhard Pippan (1) , Martin Hafok (1)

1 ESI - Erich Schmid Institute of Materials Science

Nickel single crystals with different crystallographic orientations were deformed by high pressure torsion. Special attention is devoted to the examination of micro-texture evolution and the development of the microstructure. The initial crystal orientation was found to have a significant effect on the hardening and evolution of micro-texture at low and medium equivalent strains, whereas at very high strains no orientation effect was observed and the behaviour was very similar to a polycrystal. The evolution of micro-texture is in good qualitative agreement with the full constrained Taylor model. At very high equivalent strains the initial crystal orientation has no influence on micro-texture. At such strains the hardening, the refinement of the structure and the texture reaches a saturation. The final micro-texture is explained by the change from one preferred crystallographic orientation to another.

Mots clés: Physical Sciences

Reinhard Pippan, Martin Hafok. High pressure torsion applied to nickel single crystals. Philosophical Magazine, 2008, 88 (12), pp.1857-1877. ⟨10.1080/14786430802337071⟩. ⟨hal-00513939⟩