https://doi.org/10.1140/epjs/s11734-026-02386-9
Regular Article
Microstructure and tip shape of crystals in Al–Si alloys
1
Chair of Nuclear and Medical Technologies, Faculty of Environmental Monitoring, International Sakharov Environmental Institute of Belarusian State University, Dolgobrodskaya str., 23/1, 220070, Minsk, Republic of Belarus
2
Laboratory of Multi-Scale Mathematical Modeling, Department of Theoretical and Mathematical Physics, Ural Federal University, Lenin ave., 51, 620000, Ekaterinburg, Russian Federation
3
Laboratory of Mathematical Modeling of Physical and Chemical Processes in Multiphase Media, Ural Federal University, Lenin ave., 51, 620000, Ekaterinburg, Russian Federation
a
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Received:
10
March
2026
Accepted:
13
May
2026
Published online:
23
May
2026
Abstract
This study investigates the microstructure and dendrite tip morphology of Al–Si alloys obtained at various melt cooling rates. Experimental analysis reveals distinct layered structures in melt-spun foils, contrasting with conventional dendritic solidification in bulk samples. A homogeneous layer of foil adjacent to the crystallizer is formed by chemically partitionless crystallization during the movement of an initially flat front, which then transforms into a cellular-dendritic form. The layer at the freely solidifying side crystallizes according to the mechanism of formation of primary dendrites and a eutectic mixture in the interdendritic spacing, however, the size of the dendrites is of the order of magnitude smaller than at equilibrium crystallization. Primary and secondary dendrite arm spacings are measured for different alloy compositions and cooling rates. In addition, we confirm that the shape of Al–Si dendrites is in agreement with recently developed Geometrically Morphological Theory [28].
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© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2026
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
