Copper diffusion in single-crystalα−Zr

Abstract

Tracer diffusion of ${}_{}{}^{64}{}_{}{}^{}\mathrm{Cu}$ in $\alpha -\mathrm{Z}\mathrm{r}$ single crystals has been measured in the temperature range (615-860)°C. The temperature dependences of the ${}_{}{}^{64}{}_{}{}^{}\mathrm{Cu}$ diffusion coefficients in directions parallel to and perpendicular to the $c$ axis are given by $D_{\parallel }={0.40e}^{\frac{-1.54\mathrm{}\mathrm{eV}}{\mathrm{kT}}}$ and $D_{\perp }={0.25e}^{\frac{-1.60\mathrm{}\mathrm{eV}}{\mathrm{kT}}}$ ${\mathrm{cm}}^2$/sec, respectively. The results are discussed in terms of an interstitial diffusion mechanism.