Orientation Dependent Subgrain Growth During Isothermal Annealing of High-Purity Aluminum

Abstract

The orientation dependence on recovery have been studied in polycrystalline high-purity aluminum (99.99 wt\%). After cold-rolling to 95\% reduction (epsilon = 3.0), samples were annealed at 180, 200, 220 and 240 degrees C. Through detailed EBSD characterization of average subgrain size and boundary misorientation during annealing, the rate of recovery in Cube and Goss was found to be faster than in the typical deformation texture components, particularly after an incubation time when discontinuous subgrain growth occurred. Subgrains with the Bs orientation grew marginally faster than Cu and S. In Cube, Goss and Bs (240 degrees C) where rapid growth was observed, a slight increase in the average boundary misorientations and a transition to discontinuous growth was observed. In Cu and in most cases Bs, continuous growth was accompanied by a weak decrease of the misorientations. Although exhibiting similar growth behavior, continuous growth of subgrains with S orientations resulted in larger misorientations.