Theoretical calculation of the kinetic coefficient of normal crystal growth
Yükleniyor...
Dosyalar
Tarih
2004
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Trans Tech Publications Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
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