论文信息 - Diffusion of 60Co in Zr50Ti50 a new anomaly

Diffusion of 60Co in Zr50Ti50 a new anomaly

Abstract The diffusion of 50Co in the b.c.c. phase of a 50 : 50 at.% Zr-Ti alloy has been measured over the temperature range 600 to 1625°C. The diffusivities are very high and close to those for cobalt in β-Zr. The Arrhenius plot is linear between 600 end 1000°C, shows a positive curveture from 1000 to 1360°C, and then undergoes a change in the sign of the curvature from 1400 to 1625°C. The results suggest that diffusion occurs by e combination of interstitial jumps and substitutional solute-vacancy exchanges. Although the shape of the Arrhenius curve cannot be accounted for in terms of a straightforward development of the model, it is accurately represented by an expression of the form. Dm = A1 exp (−βQ1) + [1 - A2 exp (−βQ2)] A3 exp (−βQ3), β ≡ I/kT

S. Kumar | G. Kidson | G. Young

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