Recrystallization of High Symmetry Aluminium Single Crystals AfterPlane Strain Compression

Recrystallization textures have been correlated with the initial deformation textures and microstructures of 3 high symmetry orientations of aluminium crystals deformed in plane strain compression up to true strains of 1,5 and annealed at 400°C. The deformation textures were characterised by X-ray pole figures and the recrystallized grain orientations by SACP. The initial orientations were chosen to provide different types and spatial distributions of potential nucleation sites in the form of high lattice misorientation regions.In the case of 2 of the orientations, the recrystallization textures could be derived from the initial deformation textures by means of the 30-40° orientation relationship characteristic of oriented growth. These orientations, {111} and {110} do not appear to form large numbers of transition bands.However, during plane strain compression, the {001} cube orientation splits into many {012} bands misoriented by large rotations of opposite sign about TD. Subsequent recrystallization develops a strong cube texture, probably as a consequence of oriented nucleation from the relatively high density of cube oriented nuclei in the residual transition band regions. It is concluded that the controlling mechanism of recristallization texture development-oriented growth or oriented nucleation-depends upon the initial grain orientation.