Behaviour and mechanisms of recrystallization at grain boundaries were
investigated on stoichiometric Ni3Al which was unidirectionally solid
ified by a floating zone method. Two specimens were deformed in tensio
n to the two strains of about 0, 17 and 0.28, and then were annealed a
t 1173 K for 3.6 x 10(3) s and 7.2 x 10(3), respectively. Recrystalliz
ed grains were formed by two kinds of mechanisms preferentially along
the grain boundaries. The strain induced boundary migration (SIBM) mec
hanism can operated where dislocations with edge components impinged a
nd piled up against the grain boundary. The other is the (111) rotatio
n mechanism along the grain boundary where dislocations with screw com
ponents impinged and piled up. These results are similar to those in a
luminum and copper, especially copper bicrystals.