Recrystallisation textures of particle-containing Al-Cu and Al-Mn single crystals

The influence of second-phase particles on the recrystallisation textures o f rolled Al-Cu and Al-Mn single crystals is studied. Single crystals with t he initial orientations (011)[100], (011)[21 (1) over bar], (112)[11 (1) ov er bar] and (001)[100] are investigated by means of X-ray pole figure measu rements and TEM microstructure analysis. The recrystallisation textures are interpreted in terms of a growth selection out of a limited spectrum of nu cleus orientations. In the case of stable initial orientations the nucleus spectrum is produced by the lattice rotations within the deformation zones around the second-phase particles. For unstable orientations the nucleus sp ectrum can be attributed to the relation paths during the orientation chang es upon rolling deformation (orientation splitting or rotations). During th e subsequent growth selection, orientations with a 40 degrees [111] orienta tion relation to the rolling texture prevail and, thus, form the recrystall isation textures observed. Interestingly, this preference of grains with a 40 degrees [111] orientation relation occurs at the very early phases of re crystallisation, right at the transition from a potential nucleus to a recr ystallised grain. This process is labelled micro-growth selection. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Lid. All rights reserve d.