Abstract
Al-5.5%Zn-2.4%Mg-1.5%Cu alloy ingots containing 0.27%Cr or 0.13%Zr were subjected to different treatments, cold-rolled by 53%, solutionized at 470°C for 1 h, and then recrystallized structures were examined, mainly as a function of initial grain size (d0) and fraction recrystallized (f0). Numerical density of recrystallized grain generally increased with the increase in f0, as well as the decrease in d0, leading to the decrease in grain size after solutionizing. This phenomenon was explicable, assuming that boundaries between recrystallized and unrecrystallized regions, as well as so called grain boundaries, act as the nucleation sites for recrystallization. Marked grain refinement of solutionized specimens would be capable, if the treatment which decreases d0 and increases f0 is made in combination with over-aging before cold-rolling.
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