Theoretical calculation of the kinetic coefficient of normal crystal growth

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Tarih

2004

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

Trans Tech Publications Ltd

Erişim Hakkı

info:eu-repo/semantics/closedAccess

Araştırma projeleri

Organizasyon Birimleri

Dergi sayısı

Özet

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.

Açıklama

Anahtar Kelimeler

Atomic mobility, Brownian motion, Crystal-melt interface, Diffusion in liquids, Glass-transition, Interface diffusion, Kinetics of crystal growth, Undercooled liquids, Viscosity, Vogel-Tammann-Fulcher law, Melt interfacial-tension, Temperature-dependence, Crystallization, Brownian movement, Computer simulation, Functions, Glass transition, Thermodynamic properties, Crystal-melt interface, Interface diffusion, Crystal growth

Kaynak

Journal of Metastable and Nanocrystalline Materials

WoS Q Değeri

N/A

Scopus Q Değeri

N/A

Cilt

20-21

Sayı

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.20-21.546