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Precipitate coarsening during aging of Al−0.28 wt.% Sc alloy: dark-field TEM images of Al3Sc precipitates aged at (a) 400 °C for 5 h, (b) 400 °C for 50 h, (c) 425 °C for 50 h, and (d) 450 °C for 50 h; (e) change in the average precipitate radius r with aging time t for temperatures indicated [41].
