902970.fig.003a
(a)
902970.fig.003b
(b)
902970.fig.003c
(c)
902970.fig.003d
(d)
902970.fig.003e
(e)
902970.fig.003f
(f)
Figure 3: Effects of different aging times on alloys’ microstructure at 190°C for (a) 4 h, (b) 8 h, (c) 12 h, (d) 16 h, (e) 20 h, and (f) 24 h.