THE DIFFUSION OF COBALT AND IRON IN PURE DELTA IRON
The diffusion of Fe/sup 59/ and Co/sup 60/ in delta -Fe were measured using a sectioning technique. The diffusion penetrations were determined by counting the radioactivity in the sections removed and also by the residual activity method. The results are summarized by the equations: D/sub Fe/= 1.9 exp STA-57.0 x 10/sup 3//RT! and D/sub Co/ = 5.5 exp STA-61.2x 10/sup 3//RT!. In both cases the activation energy and D/sub O/ are significantly less than values previously reported for diffusion in the paramagnetic region of alpha -Fe. This amounts to approximately a threefold decrease in the value of D below that expected from extrapolation of the alpha -Fe data. The results indcate that were iron to retain the bcc structure at all temperatures, the activation energy would demonstrate a nonlinear functional dependence on temperature. (auth)
- Research Organization:
- Univ. of California, Livermore
- NSA Number:
- NSA-17-029338
- OSTI ID:
- 4712307
- Report Number(s):
- UCRL-7124
- Journal Information:
- Acta Met., Journal Name: Acta Met. Vol. Vol: 11
- Country of Publication:
- United States
- Language:
- English
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