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Field emission scanning electron microscopy (FESEM) micrographs showing the microstructure and the formation of precipitates after aging treatments of varying temperature and duration. Aging at 565 °C for 24 h (a) and higher magnification (b), aging at 740 °C for 2 h (c) and 24 h (d), aging at 800 °C for 4 h (e) and 24 h (f), aging for 870 °C for 4 (g) and 24 h (h).
