Precipitation Behavior of the Topologically Close-Packed Phase in the DD5 Superalloy during Long-Term Aging

Figure 4

SEM micrographs of TCP phases in the grain boundaries annealed at 950°C for different hours: (a) 100 h, (b) 500 h, (c) 1000 h, and (d) 2000 h.

(a)

(b)

(c)

(d)