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By Gerhard Wilde (Eds.)

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Having determined Pa ϭ saδaDa/λ and Da separately in the C–B and C–C regimes, respectively, the factor saδa/λ can be estimated. 5 nm and d ϭ 100 nm, an upper estimate of the product saδa is obtained, saδa Ϸ 1 nm. Since the interagglomerate boundaries present a more open structure with respect to the nano-GBs, the value of δa Ϸ 1 nm seems to be a good estimate [124]. Thus, the segregation factor sa for Ag seems to be about unity. This means that there is practically no excess of Ag atoms in the interagglomerate boundaries with respect to the nanocrystalline GBs, Eq.

Filled symbols represent the diffusivity of nanocrystalline GBs and open symbols correspond to interagglomerate boundary diffusion. The estimate δa ϭ 1 nm was used to recalculate measured Pa values to the relevant diffusivities Da. The triple product P for Ag diffusion in coarse-grained FeNi alloy is also shown (diamonds). The method of calculation of the segregation factor s for Ag in FeNi is illustrated. with the direct data on Dgb (determined for the nanocrystalline material). 29). g. s ϭ 1000 at T Ϸ 700 K.

Therefore, if non-equilibrium GBs exist in the as-deformed state, they may rapidly relax during the initial stages of the diffusion anneals in the considered cases of UFG Pd and Al. 17wt% Zr alloy was investigated [139]. 17wt% Zr alloy deformed by ECAP [139] (circles) in comparison to the Ni diffusivity in high-purity coarse-grained Cu [108] (squares). The diffusivities of ‘slow’ (open circles) and ‘fast’ (full circles) short-circuit diffusion paths in UFG Cu alloy are shown. alloy in the range of temperatures and annealing times suitable for GB diffusion measurements.

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