Theoretical calculation of the kinetic coefficient of normal crystal growth
Künye
Dimitrov, V. I. (2004). Theoretical calculation of the kinetic coefficient of normal crystal growth. Journal of Metastable and Nanocrystalline Materials, 20-21, 546-552. doi:10.4028/www.scientific.net/JMNM.20-21.546Özet
An expression for the velocity u of migration of a diffuse simple crystal-melt interface has been derived on the basis of the theory of atomic mobility in supercooled liquids: u = K-0 (T / T-m) DeltaT, where DeltaT = T-m - T the undercooling below the melting point T-m; K-0 is the kinetic coefficient of atomic attachment, which is used in models of crystal growth. It has been calculated for a number of metals. u(max) = K0Tm / 4 is the theoretical limit of the velocity of crystal growth. For a number of FCC metals the theoretical limit of crystal growth has been found to be of order of 200 m/s. The crystal growth kinetics has been shown to be limited by the atomic self-diffusion in the interface, for which the strong dependence on the orientation of the crystal/melt interface has been explained.
Kaynak
Journal of Metastable and Nanocrystalline MaterialsCilt
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