Abstract
Polycrystalline copper having a (2 9 11)[\bar9\bar45] orientation formed after 93.7 pct rolling were cold rolled by 6∼91 pct perpendicular to the primary rolling direction. Investigations were made on slip rotations from a (2 9 11) [8 ‾10 7] toward a (\bar112)[1\bar11] orientation during rolling and the origin of the cube texture. A rolling texture after about 25 pct rolling can be described as a (011)[1\bar11] orientation with respect to the secondary rolling direction. With increasing rolling reduction, the (011)[1\bar11] orientation rotates toward (011)[2\bar11] orientation under the operation of slip systems bearing the maximum resolved shear stress. Under a condition in which extensive cross slip occurs, the normal to the rolling plane approaches the [\bar123] axis. A (\bar112)[1\bar11] orientation is newly formed after more than 80 pct rolling. In order to cause the (011)[1\bar11] to displace toward (\bar112)[1\bar11], it is necessary that the cross slip systems and the slip systems which lock up the rolling direction at [1\bar11] must operate extensively during rolling. At 25∼50 pct reduction, the annealing texture of α-brass type (225)[\bar7\bar34] cannot be observed, but that described as (013)[100] or (012)[100] orientation is developed from the rolling texture near (011)[\bar2\bar11] with respect to the primary rolling directions. In case that the rolling reduction is 25∼63 pct, complicated annealing textures are formed. The main component of the textures can be related to that of the rolling texture by 30°∼45° rotations around the common ⟨111⟩ axis. In consequence, it is probable that the orientation dependence of grain growth velocity is an important factor in the formation of the annealing textures.
