Radiotracer experiments were performed on oriented Ag/Cu bicrystals in order to study the effect of the inter-phase boundary structure upon mass transport along the interfaces. The tracer diffusion of 110mAg was measured along (011) inter-phase boundaries in the [100] and [011¯] directions, and along (111) inter-phase boundaries in the [011¯] and [2¯11] directions, at temperatures ranging from 593 to 882K (tables 15 and 16). It was shown that, for the cube-on-cube orientation, the interfacial structure was reflected in the diffusion behavior. It was found that Ag diffusion along anisotropic misfit dislocation arrays in (011) inter-phase boundaries was anisotropic, and was fastest along channels of rapid diffusion. Scatter in the diffusion data for (011) inter-phase boundaries indicated that their structure, contrary to morphologically stable (111) interfaces, depended upon the thermal history of the specimens. This was attributed to micro-faceting of the morphologically unstable (011) interphase boundaries.

J.Sommer, T.Muschik, C.Herzig, W.Gust: Acta Materialia, 1996, 44[1], 327-34