By HIP processing, the NiAl-20 vol% TiC in situ composite fabricated b
y the hot-pressing aided exothermic synthesis (HPES) technique was fur
ther densified and the TiC particles in the NiAl matrix tended to beco
me round, and the NiAl/TiC interfaces, which were flat and smooth, bec
ome overlapping in most cases. The effect of the microstructure on yie
ld strength is also discussed.