626240.fig.007a
(a)
626240.fig.007b
(b)
Figure 7: SEM microstructures of Ni3Al/Ni3V two-phase intermetallic compounds: (a) type 1 and (b) type 2 after the immersion times of 24 hours and 96 hours in 0.5 kmol/m3 HNO3 solution at 303 K.