Dislocation patterns on the common primary slip-plane in fatigued [¯134]-[18 ¯2 7] bicrystals with a Σ = 19b grain boundary were investigated by using the electron-channelling contrast technique in a scanning electron microscope. The results showed that a 2-phase dislocation structure (such as veins, and persistent slip-band walls embedded within veins) could be clearly seen on the common primary slip plane. Interactions of persistent slip bands with the grain boundary were clearly revealed. It was found that there were 3 types of interaction between the grain boundary and the dislocations during cyclic deformation. It was suggested that the dislocations which were carried by persistent slip bands could not be continuously transmitted through the grain boundary; even though the bicrystal had a common primary slip plane and its surface slip bands were continuous across the grain boundary.

Interactions of Persistent Slip Bands with a Grain Boundary on the Common Primary Slip Plane in a Copper Bicrystal. Z.F.Zhang, Z.G.Wang: Philosophical Magazine Letters, 2000, 80[3], 149-56