F. Inoko et T. Yoshikawa, FORMATION OF RECRYSTALLIZED GRAINS AT GRAIN-BOUNDARIES OF COPPER BICRYSTALS DEFORMED IN TENSION, Materials transactions, JIM, 34(4), 1993, pp. 334-342
In order to clarify the formation mechanisms of recrystallized grains
along grain boundaries, 99.99 mass% copper bicrystals were prepared us
ing the modified Bridgman method. They were deformed in tension to the
strain of 30-40% and annealed at certain conditions to get the early
stage of primary recrystallization along the grain boundaries. The for
mation of recrystallized grains along the grain boundaries due to the
strain induced boundary migration (SIBM) was observed, especially duri
ng the in situ observation by TEM. The formation of recrystallized gra
ins due to the SIBM occurred along the grain boundaries with a high ti
lt component, toward which dislocations with large edge components pil
ed up. The formation due to the [111] rotation mechanism occurred, on
the other hand, along the grain boundaries with a high twist component
, toward which dislocations with large screw components piled up. Duri
ng the migration of the original grain boundaries many annealing twins
were formed.