Influence of Grain Boundary on the Fatigue Crack Growth of 7050-T7451 Aluminum Alloy Based on Small Time Scale Method

Figure 10

Micromorphology of fatigue crack at different loading cycles: (a) at 126 cycles, (b) at 129 cycles, (c) at 130 cycles, and (d) at 131 cycles.

(a)

(b)

(c)

(d)