Abstract
The diffusion of carbon atoms between the volume and the surface of (100) molybdenum is directly studied at temperatures between 1400 and 2000 K (i.e., at process temperatures) for the first time. The balance of carbon atoms in the system is determined. The difference in the activation energies of carbon dissolution and precipitation, ΔE=E s 1-E1s, is found for the case when the diffusion fluxes of dissolved and precipitated carbon atoms are in equilibrium. This difference defines the enrichment of the surface by carbon relative to the bulk. The experimentally found activation energy of carbon dissolution is Es1=3.9 eV. The activation energy of carbon precipitation is estimated at E 1 s=1.9 eV. The latter value is close to the energy of bulk diffusion of carbon in molybdenum.
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Translated from Zhurnal Tekhnichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 72, No. 4, 2002, pp. 113–119.
Original Russian Text Copyright © 2002 by Gall’, Rut’kov, Tontegode.
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Gall’, N.R., Rut’kov, E.V. & Tontegode, A.Y. Carbon diffusion between the volume and surface of (100) molybdenum. Tech. Phys. 47, 484–490 (2002). https://doi.org/10.1134/1.1470600
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DOI: https://doi.org/10.1134/1.1470600