An Al-6 wt.-%Mg alloy containing Zr, Cr, and Mn was found to deform highly superplastically when produced in a heavily cold-rolled and recrystallized condition. Grain-boundary sliding was detected during superplastic flow of this alloy and dislocations were observed to interact with precipitate particles within grains. The alloy specimens, obtained at 0°, 45°, and 90° to the rolling direction, exhibited anisotropy with respect to their flow stresses and textures. The superplastic deformation process in this alloy can be well explained in terms of grain-boundary sliding accommodated by dislocation motion within grains.
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