抄録
The effect of the annealing twin boundary on plastic deformation of fcc metals was investigated by comparing the deformation behaviour of copper crystals containing a twin band with that of single crystals. As deformation proceeds, dislocations pile-up against the twin boundary and the slip mode near the boundary is changed from that in the centre of the grain. Therefore, the flow stress of a crystal containing a twin band is larger than that of a single crystal. The twin boundary acts as a barrier against the dislocation motion and the effect of the annealing twin boundary on plastic deformation of copper crystals is thought to resemble that of the grain boundary. Especially, it is pointed out that the annealing twin boundary must be treated in the same way as the grain boundary with respect to the Hall-Petch relationship.
