抄録
Yield stress anisotropy in Al–Mg alloy sheets was studied from viewpoints of microstructure and arrangement of dislocation cell walls. The specimens were annealed for recovery after heavy cold rolling. Behavior of the anisotropy change with the annealing is strongly affected by the type of initial dislocation arrangement introduced by cold rolling. In the type of specimens having inhomogeneous deformation structures such as shear bands or deformation zones developed around coarse particles, both ΔYS0°–45° and ΔYS90°–45° decreased with an increase in annealing temperature where ΔYS0°–45° and ΔYS90°–45° are the difference in yield stresses between the specimens taken from the rolled sheets paralleled and 45° to the rolling direction and perpendicular and 45° to the rolling direction, respectively. Consequently the difference between the maximum and minimum yield stresses, ΔYS, decreased with the annealing. On the other hand, in the type of specimens having less inhomogeneous deformation structures, ΔYS0°–45° decreased with the annealing temperature. However, ΔYS90°–45° exhibited a tendency to increase. Therefore, a minimum ΔYS appeared at an annealing temperature.
