Fig. 1. Schematic diagram of various heat treatments for Al-0.6 Mg-1.2Si sheets (S.T.: solution-treated at 550 ℃ for 30 min, N.A.: natural-aging for 1 week, B.H.: bake-hardened at 180 ℃ for 30 min, and W.Q.: water quenching).

Fig. 1. Schematic diagram of various heat treatments for Al-0.6
Mg-1.2Si sheets (S.T.: solution-treated at 550 ℃ for 30 min,
N.A.: natural-aging for 1 week, B.H.: bake-hardened at 180 ℃ for
30 min, and W.Q.: water quenching).