https://doi.org/10.1140/epjs/s11734-023-00855-z
Regular Article
Chemically partitionless crystallization in near-eutectic rapidly solidified Al–12, 6Si–0, 8Mg–0, 4Mn–0, 7Fe–0, 9Ni–1, 8Cu alloy
Chair of Nuclear and Radiation Safety, International Sakharov Environmental Institute of Belarusian State University, 23/1 Dolgobrodskaya str., 220070, Minsk, Belarus
Received:
14
February
2023
Accepted:
26
April
2023
Published online:
17
May
2023
The paper presents the results of a study of the microstructure of the of the alloy Al–12.6 wt% Si–0.8 wt% Mg–0.4 wt% Mn–0.7 wt% Fe–0.9 wt% Ni–1.8 wt% Cu obtained by rapid quenching from the melt at an average melt cooling rate of 
K/s. Using scanning electron microscopy and energy-dispersive X-rays spectroscopy, it was found that the foil has a layered microstructure in cross section, while the elemental composition is uniform in thickness. It is shown that in the foil layer adjacent to the mold, chemically partitionless crystallization proceeds with the formation of a supersaturated solid solution based on Al with a microcrystalline grain structure. A transition layer with a microstructure containing globular microdendritic areas has been found. It is shown that ultrafast quenching from the melt and the doping by alloying elements leads to the formation of silicon nanoparticles. A mechanism for the formation of a layered microstructure which consider changes in the solidification conditions at the solid–liquid interface, is proposed.
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