Features of crystal lattice rotations in polycrystalline aluminum samples during deformation under uniaxial tension at 300 K

The results of experimental studies on the regularities of crystal lattice rotations during plastic deformation of large-grained aluminum samples are presented. The studies were carried out using an original high-resolution technique based on obtaining color orientation maps from the entire surface of the samples. A wide variety of different ways in which the crystal lattice can rotate has been discovered. These include grain rotation and fragmentation, the formation of various types of rotational structures, flare-shaped rotations, complex rotations occurring simultaneously in adjacent grains, rotations that alter the configuration of grain boundaries, and others. For the first time, possible mechanisms of grain rotation during the deformation of large-crystal samples have been identified. They consist of the restructuring of the subgrain structure within the grain. Such restructuring can be relay-like or chaotic in nature. Experiments have shown that with such grain rotation mechanisms, the magnitude can be 10–15 deg, and the magnitude of the relative grain deformation can exceed that for the entire sample.