Effect of particle stimulated nucleation on orientation of recrystallized grains

Abstract

An Al-6 wt-%Ni alloy containing a volume fraction of 0.1 of 1.1 μm dia. particles was deformed 95% by cold rolling and annealed. Recrystallization was nucleated in the vicinity of the particles, and the orientation of the new grains was investigated by X-ray and electron diffraction. The orientation of the recrystallization nuclei was found to be almost random, with the majority of nuclei being misoriented by 15–45° from the adjacent matrix, and this was interpreted in terms of nucleation within the deformation zone at the particles. In the fully recrystallized material, however, the texture was significantly sharper than in the deformed material, and this was ascribed to the more rapid growth of grains of selected orientations.