抄録
The effect of solid solution and precipitation on recrystallization of Al–Mg–Si alloys was investigated. Hot-rolled sheets were heated at 823 K, and then they were treated with or without intermediate annealing (IA) at 623 K. Both samples were rolled at room temperature up to 87.5% and annealed finally at 623 K. The sheets with IA (IA sample) showed recrystallized grains elongated to rolling direction. The sheets without IA (non-IA sample) consisted of small equiaxial recrystallized grains. Cube (｛001｝〈100〉) texture density of the IA sample was higher than that of the non-IA sample. In the IA sample, β-phase precipitates and the precipitate free zone (PFZ) were formed by IA. The PFZ was likely to be elongated with rolling and become a preferential recrystallization zone. Therefore, recrystallized grains grew along the elongated PFZ and formation of long cube orientation grains caused high density of cube texture. On the other hand, in the non-IA sample, shear bands were formed by rolling. They were speculated to work as recrystallization sites. Because of origination of randomly oriented grains from shear bands, it was assumed that small equiaxial recrystallized grains were formed and the density of cube texture decreased.
