THE ANNEALING BEHAVIOR OF DEFORMED PARTICLE-CONTAINING ALUMINUM SINGLE-CRYSTALS

Deformed particle-containing single crystals of initial orientation (001)[110] whose deformation behaviour is discussed in an accompanying paper [Acta metall. mater. 42 (1994)] have been annealed until partially or fully recrystallised. At particles larger than 3 mum and at strains greater than 0.7, particle stimulated nucleation of recrystallisation (PSN) occurs. The PSN grains have well defined orientations, and at least two PSN orientation components have been identified. These orientations are among those predicted by a deformation model presented in the accompanying paper. At strains of less than 2.3, the PSN grains are often outgrown by other texture components. Under these circumstances the PSN grains are frequently left as ''island grains'' within the rapidly growing grains, and the contribution of the PSN orientations to the texture of the fully recrystallized material may be small. At strains of 2.3, some of the PSN grains may grow as rapidly as the other grains. The rapidly growing grains often have a platelike habit and an orientation relationship of approximately 40-degrees about a [111] axis to the deformed matrix. However, in some cases, equiaxed grains with other orientation relationships to the matrix show rapid growth. The relative growth rates of grains of different origin provides very strong evidence of oriented growth during recrystallisation.