Diffusion of nickel into iron

摘要: The diffusion of nickel into iron was measured in the temperature range 600 to 1050 deg C. Radioactive Ni/sup 6//sup 3/ used as tracer element; surface-decrease and residualactivity sectioning methods were employed. diffusivity below Curie observed be lower than that expected from an extrapolation data for paramagnetic alpha-iro-n. coefficients may expressed follows (in cm/sup 2//sec): gamma-iron, D = 0.77 exp (-67,000/RT); alpha-iron above 800 C, 1.3 (-56,000/ RT); ferromagnetic 680 1.4 (-58,700/RT). anomalous decrease coefficient starts at about somewhat temperature, is thought associated with effect short magnatic order on formation energy vacancies. (auth)