Effect of texture and grain structure on tensile strength and anisotropy in annealed Al−Cu−Mg alloy with high Cu/Mg mass ratio

Texture and grain structure evolution during annealing and their effects on tensile strength and anisotropy were studied using XRD, DSC, SEM, EBSD and TEM. The results indicate that elevated rolling temperatures reduce the f ( g ) max(Copper) / f ( g ) max(Brass) ratio, increase S−Brass fine bands, and promote S-dispersoid precipitation, leading to finer recrystallized grains. Dominant recrystallization textures transform from Goss + P to Goss and then to Goss + Cube with increasing rolling temperature. Annealing at 350 °C shows four tensile strength response stages: fast softening I, rapid strengthening II, slow strengthening III, and slow softening IV. The transition from Stages I to II is driven by the formation of strong Goss and P textures, and Stage IV is linked to enhanced Cube texture. Plates with Goss + Cube textures and fine equiaxed grains exhibit the lowest YS/UTS ratio and minimal anisotropy.