抄録
In the present study the grain boundary sliding behavior was investigated on zinc bi-crystal specimens containing some coincidence boundaries. Zinc bi-crystals whose orientations were controlled with seed crystals were grown from the melt by a modified Bridgman method. The (1211), (1216) and (1012) coincidence boundaries in zinc were selected as typical cases. Bi-crystal test pieces where the grain boundary plane is inclined by 45 degrees to the tensile axis had dimensions of about 5mm × 4mm × 50mm. A tensile load was applied to the specimen at elevated temperatures. For the selected coincidence boundaries, the grain boundary dislocation modeling predicts a characteristic behavior of grain boundary sliding, based on the geometric framework of CSLs and DSC lattices. It is predicted that the grain boundary sliding should accompany grain boundary migration whose amount and direction is uniquely correlated to the grain boundary sliding. This theoretical prediction was proved to be true on the (1211), (1216) and (1012) coincidence boundaries where the amount of the grain boundary migration was about 2, 8, and 7 times larger than that of grain boundary sliding, respectively. The experimental results gave a clear-cut evidence supporting the DSC dislocation mode ling of grain boundary sliding in coincidence boundaries.
