抄録
Yield stress anisotropy in 85% cold rolled and low temperature annealed sheets of Al–Mg alloys was studied from viewpoints of both texture and microstructure using X-ray diffraction, resistivity measurement and TEM. Texture analysis by X-ray diffraction suggests that the texture has little effect on the yield stress anisotropy of cold rolled and annealed sheets. In contrast, the result of resistivity suggests that the anisotropic arrangements of dislocation cell walls have a significant effect on the yield stress anisotropy. TEM observation shows that deformation zones developed around coarse particles have a random arrangement to the rolling direction and shear bands have geometrical arrangement to it. Further, they have considerably high dislocation density. It is concluded that these dense dislocation regions, which act as obstacles to slip, influence the yield stress anisotropy of cold rolled and annealed sheets.
