Effect of high pressure heat treatment on the recrystallization and recrystallization texture of CC AA 3003 aluminum alloy
Peng Du, Haiyang Sun, Zhijie Wang, Yanming He, Guoliang Sheng, Jiaxin Zhang, Wenchang Liu
Abstract
The hot band of CC AA 3003 aluminum alloy was cold-rolled to different reductions, and then annealed at 482 °C for 1 h under different pressures. The evolution of microstructure and texture was investigated. High pressure heat treatment can refine recrystallized grains and weaken pinning effect. The average grain size decreases from 205.17 μm to 73.54 μm with the increasing pressure from atmosphere pressure to 6 GPa. In the meanwhile, the aspect ratio increases from 0.18 to 0.72. Compared with atmosphere pressure, the fine precipitates (50–150 nm) disappear after pressurization, the number density of large precipitates increases and the average size of large precipitates decreases. The recrystallization textures are characterized by the weak P and R-cubeND components and a relatively strong M component under atmosphere pressure. The intensities of the P and M components increase with the increasing rolling reduction, while the R-cubeND component changes slightly. With the increase of pressure, the P and R-cubeND components strengthen, while the M component weakens significantly, nearly disappears. The hardness decreases slightly with the increasing rolling reduction in the sheets annealed under atmosphere pressure and increases slightly with the increasing rolling reduction after pressurization. In addition to that, the hardness increases slightly with the increasing pressure in the sheets with the same rolling reduction.