Affiliation:
1. Westfälische-Wilhelms Universität Münster
Abstract
Recent results on radiotracer grain boundary diffusion of different solutes in the same
high-purity polycrystalline copper are reviewed. The measurements were performed in extended
temperature intervals satisfying Harrison’s B and C regime conditions at higher and lower
temperatures, respectively. In the B regime, the triple product P = sδDgb was determined, while the
grain boundary diffusivity Dgb was directly measured in the C regime (s is the segregation factor
and δ the grain boundary width). Consequently, the segregation of different solutes in the copper
matrix was determined for the true dilute limit conditions. The results on grain boundary diffusion
and segregation are analysed in relation to the solute – solvent binding and solute – vacancy
interaction in the bulk and in the grain boundaries. By increasing amount of the applied radiotracer
the effect of solute concentration on grain boundary diffusion can thoroughly be examined. Grain
boundary diffusion experiments on well-characterised bicrystals have been shown to be most
suitable for such a study. In a radiotracer experiment, the complete solute segregation isotherm can
be measured beginning already from a dilute solution in both, bulk and grain boundary.
Publisher
Trans Tech Publications, Ltd.
Subject
Condensed Matter Physics,General Materials Science,Radiation
Cited by
5 articles.
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