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International Heat Transfer Conference 12

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Study of morphological instability during crystal growth using AHP method

Marina P. Marchenko
Institute for Mathematical Modelling RAS, 125047 Moscow, Miusskaya sq. 4a, Russia

I. V. Frjazinov
Institute for Mathematical Modelling RAS, 125047 Moscow, Miusskaya sq. 4a, Russia

Vladimir D. Golyshev
Center for Thermophysical Researches “Thermo”, Institutskaya 1, Alexandrov, Vladimir Region, 601650, Russia

Victoria Timchenko
School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney 2052, Australia

Eddie Leonardi
Computational Fluid Dynamics Research Laboratory, School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, Australia 2052

Graham de Vahl Davis
University of New South Wales, Kensington, NSW, Australia

DOI: 10.1615/IHTC12.3710
6 pages

Résumé

Solidification of germanium doped with antimony using AHP(Axial Heat flux close to the Phase interface) crystal growth method (Golyshev and Gonik, 1990) with growth velocity and temperature gradients changing dynamically during the process of crystal growth is investigated by comparison experimental and numerical results. The numerical modelling was performed using the KARMA1 package (Friazinov and Marchenko, 1997) modified for the AHP method. Using experimental data on the boundary conditions for the temperature and for the concentration transient distributions of temperature gradients, concentration in the melt and crystal and interface velocity are obtained. The constitutional supercooling criterion values (Voronkov, 1972, Flemings, 1974) for different conditions of solidifications used in the two experiments are compared. Investigations showed that transition from one regime to another during the experiment can substantially influence morphological stability of the solid/liquid interface.

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