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

Abstract

The influence of second-phase particles on the recrystallisation textures of rolled Al–Cu and Al–Mn single crystals is studied. Single crystals with the initial orientations (011)[100], (011)[21 1 ̄ ] , (112)[11 1 ̄ ] and (001)[100] are investigated by means of X-ray pole figure measurements and TEM microstructure analysis. The recrystallisation textures are interpreted in terms of a growth selection out of a limited spectrum of nucleus 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 spectrum can be attributed to the rotation paths during the orientation changes upon rolling deformation (orientation splitting or rotations). During the subsequent growth selection, orientations with a 40°〈111〉 orientation relation to the rolling texture prevail and, thus, form the recrystallisation textures observed. Interestingly, this preference of grains with a 40°〈111〉 orientation relation occurs at the very early phases of recrystallisation, right at the transition from a potential nucleus to a recrystallised grain. This process is labelled micro-growth selection.