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Structure Formation in the Melt-Quenched Al–12.2Si–0.2Fe Alloys

Authors
  • Gusakova, O. V.1
  • Shepelevich, V. G.2
  • Alexandrov, D. V.3
  • Starodumov, I. O.3
  • 1 International Sakharov Environmental Institute of Belarusian State University, Minsk, Belarus , Minsk (Belarus)
  • 2 Belarusian State University, Minsk, Belarus , Minsk (Belarus)
  • 3 Ural Federal University Named after the First President of Russia B.N. Yeltsin, Yekaterinburg, 620002, Russia , Yekaterinburg (Russia)
Type
Published Article
Journal
Russian Metallurgy (Metally)
Publisher
Pleiades Publishing
Publication Date
Aug 03, 2020
Volume
2020
Issue
8
Pages
885–892
Identifiers
DOI: 10.1134/S0036029520080054
Source
Springer Nature
Keywords
License
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Abstract

AbstractThe 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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