Abstract
The effects of the interaction between grains on the deformation behaviours of copper bicrystals have been studied. Four kinds of bicrystals were rolled with the trace of grain boundary as a rolling direction at room temperature reversing end to end between passes. Each partner of these bicrystals had initially the same orientation as that of any one of the several components of the pure metal type rolling texture in fcc metals, i.e. (1) N 101, (101)[\bar121]+(\bar10\bar1)[\bar121], (2) S 101, (101)[\bar121]+(211)[\bar111], (3) N 513, (513)[\bar121]+(\bar5\bar1\bar3)[\bar121], (4) S 513, (513)[\bar121]+(100)[011].
The shear deformation in the rolling plane was almost restrained in the type N bicrystal, but a severe shear took place on both partner grains in the type S bicrystal. These shape changes were explained qualitatively from the viewpoint of the interaction between component grains during rolling deformation.
The initial orientations of the (101)[\bar121] and (513)[\bar121] grains were maintained up to high reductions independently of the type N or S. The (211)[\bar111] grain was deformed with shear in the rolling plane accompanying a small fluctuation of the orientation about the rolling direction. In the (100)[011] grain, the lattice rotation toward (211)[\bar111] occurred.
The orientation changes in thes grains seem not to contradic to those deduced from the slip systems observed by replica electron microscopy, except for that in the (513)[\bar121] grain.
