Recrystallization behavior of twin-roll cast 3xxx series aluminum alloy

摘要

The effect of homogenization conditions and cold rolling reduction on the recrystallization behavior of twin-roll cast and cold-rolled 3XXX series aluminum alloy was investigated. Higher homogenization temperatures produced a finer recrystallized grain structure after annealing as the particle stimulated nucleation (PSN) was accelerated because of a weakening of the Zener pinning effect caused by coarse dispersoids. Moreover, the recrystallized grains were refined with an increase in the cold rolling reduction. However, the recrystallized grains were finer without a homogenizing treatment than with such treatment. In the non-homogenized material, it is probable that the recrystallization was promoted by the competitive growth of the coarse recrystallized grain generated near the constituent phase and the fine recrystallized grain born inside the original grain. Consequently, the recrystallized grain structure was refined as a whole. However, the recrystallized grain structure became coarser when the cold rolling reduction was too heavy. This was because the high strain accelerated PSN, and the former took priority over the latter.