Orientation relationship between recrystallized grains and parent crystal in recrystallization of aluminium single crystals

Abstract

The orientations of the new grains formed upon the spontaneous recrystallization of single crystals of extended aluminium has been studied. When the tensile strain was lower than 30 pct., the grains having random orientations were observed. While it was found that upon recrystallizing specimens of about 50 pct. elongation, the new grains were related to the parent by approximately 20 and 40 degrees rotations about common [111] axis.However, the rotations occurred in one direction only about the pole of the latent slip plane, but about no others. Futhermore, the grains having a preferred orientation showed fine substructures. It has been discussed that the mobility of the grains were related to the strained matrix by the 40 degree rotation about [111] axis may be affected by the distributions of dislocations after deformation by primary and conjugate slip, and that the present results can be accounted for solely on the basis of the orientation dependence of the growth rate of the growing grain into the matrix.