Abstract:Microstructure and texture of new Al-Zn-Mg-Cu high-strength aluminum alloy during hot planar compression deformation and annealing processes were studied by thermo-mechanical modeling planar compression experiments and Electron Back Scattering Diffraction (EBSD). The results show that the softening mechanism during deformation processes at the temperature of 350 °C and the strain rate of 0.1 s-1 is dominated by dynamic recovery and large strain geometric dynamic recrystallization (GDRX). The Rotated Cube {001} < > and the Brass {111} <110> aligned to α and β fibers, respectively, appear in the deformed alloy. After the annealing process, the Rotated Cube texture decreases and the Brass texture increases; meanwhile the Rotated Cube texture transforms to Brass texture along the α-fiber. When hot planar compression is up to 80% high reduction at 420 °C and the strain rate of 0.1 s-1, refined grains with high angle grain boundaries locate at the triangle grain boundaries formed by migration and rotation of subgrain boundaries. The Rotated Cube {110} < > and Brass {011} <211> are presented. After the annealing process, the Rotated Cube texture is enhanced, while the Brass texture transforms to Goss texture