Issues »  Volume 40, Issue 5

Non-Steady-State Growth During Directional Solidification of Various Crystallographic Orientations

O. P. Fedorov$^{1,2}$, V. F. Demchenko$^{3}$, E. L. Zhivolub$^{2}$

$^{1}$Space Research Institute, NAS of Ukraine and State Space Agency of Ukraine, 40, 4/1, Academician Glushkov Ave., UA-03187 Kyiv, Ukraine
$^{2}$G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{3}$E. O. Paton Electric Welding Institute, NAS of Ukraine, 11 Kazymyr Malevych Str., UA-03150 Kyiv, Ukraine

Received: 12.12.2017. Download: PDF

The growth pattern in the thin and bulk samples of various crystallographic orientations is studied using direct observation of solid–liquid interface in transparent substances and microstructure of Al–Si single crystals. The evolution of regular tilted cells and split seaweed structures is observed in thin samples for different growth orientations and growth rates. During direct study in bulk samples, elongated cells appeared only for <110> orientations, whereas, for <100> orientations, only equiaxed cells appeared. This effect is associated with simultaneous development of the regular cell and irregular seaweed structures in single crystals with growth orientation different from <100>. Continuous pattern evolution due to the effect of solute accumulation results in non-steady-state interface propagation and transformation of elongated cells eventually into equiaxed ones.

Key words: solidification microstructures, crystallographic orientation, solid/liquid interface, cell and dendrite, heat and mass transfer.

URL: http://mfint.imp.kiev.ua/en/abstract/v40/i05/0661.html

DOI: https://doi.org/10.15407/mfint.40.05.0661

PACS: 61.50.Ks, 61.72.Mm, 64.70.D-, 68.08.De, 68.70.+w, 81.10.Aj, 81.30.Fb

Citation: O. P. Fedorov, V. F. Demchenko, and E. L. Zhivolub, Non-Steady-State Growth During Directional Solidification of Various Crystallographic Orientations, Metallofiz. Noveishie Tekhnol., 40, No. 5: 661—681 (2018)

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