Characteristics of strain-induced boundary migration as evaluated by the crystal rotation axis method in (001) [100] and (112) [111] aluminum bicrystal deformed by plane-strain compression

Abstract

An aluminum bicrystal with (001) [100] and (112) [111] orientation was deformed by plain-strain compression to a strain of 0.34. The types of slip systems responsible for producing crystal rotations relative to the initial orientations were clarified by the crystal rotation axis method. In the (001) [100] crystal, an affected zone developed along the grain boundary, which revealed a variety of slip systems in operation; the operation of some of these systems could be predicted from the Schmid factor while that of the remaining systems could not. The unpredictable slip systems were activated by the formation of cross slips. After annealing at 400°C for 30 s, recrystallization that occurred was characterized by strain-induced boundary migration. The recrystallized area had the same crystal orientation as that of the affected zone of the (001) f 1001 crystal. By using the crystal rotation axis method, it was determined that the affected zone was the origin of the strain-induced boundary migration. ©2010 The Japan Institute of Light Metals.