SILVER TRACER DIFFUSION IN ORIENTED AG CU INTERPHASE BOUNDARIES AND CORRELATION TO THE BOUNDARY STRUCTURE/

Radiotracer experiments were performed on oriented Ag/Cu bicrystals to study the influence of the interphase boundary (IB) structure on the material transport along the interfaces. Tracer diffusion of Ag-100m w as measured along (011) IBs in the [100] and [01(1) over bar] directio ns and along (111) IBs in the [01(1) over bar] and [<(2)over bar 11>] directions in the temperature range 593-882 K. It is demonstrated for cube-on-cube orientations how the interfacial structure is reflected i n the diffusion behavior. It was found that the Ag diffusion along ani sotropic misfit dislocation arrays in (011) IBs is anisotropic and fas test along channels of rapid diffusion. A scatter in the diffusion dat a for (011) IBs indicates that their structure, quite in contrast to m orphologically stable (111) interfaces, depends on the thermal history of the specimens. This is interpreted as a result of microfaceting of the morphologically unstable (011) IBs. Furthermore, the influence of interdiffusion across the interface on the diffusion along the interf ace is discussed.