DIFFUSION OF NICKEL INTO IRON
The diffusion of nickel into iron was measured in the temperature range 600 to 1050 deg C. Radioactive Ni/sup 6//sup 3/ was used as the tracer element; the surface-decrease and the tracer element; the surface-decrease and the residualactivity sectioning methods were employed. The diffusivity below the Curie temperature was observed to be lower than that expected from an extrapolation of the diffusion data for paramagnetic alpha-iro-n. The diffusion coefficients may be expressed as follows (in cm/sup 2//sec): gamma-iron, D = 0.77 exp (-67,000/RT); paramagnetic alpha-iron above 800 deg C, D = 1.3 exp (-56,000/ RT); and ferromagnetic alpha-iron below 680 deg C, D = 1.4 exp (-58,700/RT). The anomalous decrease in the diffusion coefficient starts at about 800 deg C, somewhat above the Curie temperature, and is thought to be associated with the effect of short range magnatic order on the formation energy of vacancies. (auth)
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge, Mass.
- NSA Number:
- NSA-15-021165
- OSTI ID:
- 4051399
- Report Number(s):
- NYO-9427
- Journal Information:
- Acta. Met., Journal Name: Acta. Met. Vol. Vol: 9
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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