Radiotracer investigation of diffusion, segregation and wetting phenomena in grain boundaries |
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Authors: | Sergiy Divinski Christian Herzig |
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Affiliation: | 1. Institut für Materialphysik, Universit?t Münster, Wilhelm-Klemm-Str. 10, 48149, Munster, Germany
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Abstract: | The combination of so-called B- and C-type solute grain boundary (GB) diffusion measurements is a unique and reliable tool
for the determination of the solute segregation factor for the true dilute limit conditions. A series of such measurements
with different solutes in the same high purity Cu material gained comprehensive quantitative information on the solute segregation
behaviour. Specially designed radiotracer experiments on bicrystals supplied valuable information on non-linear solute segregation
and even a complete solute segregation isotherm could be determined. The strong solute segregation may invoke new effects.
The GB wetting transition in the Bi–Cu system was investigated by radiotracer diffusion. A pronounced increase of GB diffusivity
was observed in the two-phase (solid + liquid) region of the corresponding phase diagram, with the GB diffusivity of Cu being
similar to the diffusion rate in a liquid. Such a GB diffusion enhancement exists even in the single phase (solid solution
in Cu) region manifesting the existence of a pre-wetting GB phase transition in this system. |
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