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Snapshots of initial and final configurations of an nc Al sample with a mean grain size d = 20 nm. (A) Initial configuration at 300 K before strain recovery. (B–D) Final configurations after strain recovery at 300, 500, and 700 K, respectively. Some grains change their shape during annealing. Dynamic recrystallization is observed at 700 K, as evidenced by the formation of some small grains such as those labeled by “a” and “b.” (Scale bar, 5 nm.)
