In the present study, the crystal orientation and residual strains in hot rolled sheets, cold rolled foils, partially annealed foils, andadditionally rolled foils of aluminum of 99.9% (3NAl) and 99.99% (4NAl) purity used for the fabrication of electrolytic capacitors, wereevaluated by the SEM/EBSP method. The additionally rolled foils were annealed at 573K and the behavior of the growth of cube-orientedgrains and the grain boundary character were analyzed. In the hot rolled sheets and the partially annealed foils, cube-oriented grains in 4NAlwere larger in number and size than those of 3NAl. From the result, it was clarified that purity of the aluminum affected the growth of cubeorientedgrains during the thermo-mechanical treatment. In the additionally rolled foils annealed at 573 K, the growth of the cube-oriented grainsin 4NAl was faster than that in 3NAl. In both 3NAl and 4NAl, the residual strains and the grain boundary character were similar. Accordingly, itis concluded that impurity in 3NAl could have segregated at the grain boundaries around cube-oriented grains and supressed the growth of cubeorientedgrains.
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