Abstract
The microstructure, the phase composition, the component distribution, and the grain structure of the commercial eutectic Al–12.2 Si–0.2 Fe (at %) silumins formed at cooling rates of 102 and 105 K/s are studied. Three phases are detected in the alloy after solidification at both cooling rates: α-aluminum, silicon, and an iron-containing phase. The bulk samples have a heterogeneous dendritic structure with large dendrites of an aluminum-based solid solution, and a eutectic lamellar mixture of aluminum and silicon filling the interdendritic space. The melt-quenched foils are characterized by a homogeneous microstructure over the thickness; however, they have a layered structure. The rapidly solidified foils also have a homogeneous granular structure through the thickness and no pronounced texture. The mechanisms of solidification and microstructure formation are proposed for both the bulk samples and the melt-quenched foils.
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Funding
This work was supported by the Belarusian Republican Foundation for Fundamental Research (project no. F18R-195) and the Russian Foundation for Basic Research (project no. 18-58-00034).
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Translated by T. Gapontseva
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Gusakova, O.V., Shepelevich, V.G., Alexandrov, D.V. et al. Structure Formation in the Melt-Quenched Al–12.2Si–0.2Fe Alloys. Russ. Metall. 2020, 885–892 (2020). https://doi.org/10.1134/S0036029520080054
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DOI: https://doi.org/10.1134/S0036029520080054