Structure formation of a hypereutectic Al–Si alloy during rapid cooling of a deformed melt

Keywords

hypereutectic Al–Si alloy, deformation-induced rapid cooling, melt deformation, microstructure gringing, silicon dendrite, spherulite.

Cite as

Prygunova А. G., Petrov S. S., Aiupova T. A., and Prygunov S. V. Structure formation of a hypereutectic Al–Si alloy during rapid cooling of a deformed melt. Physicochemical Mechanics of Materials. 2025. 61(6), 126-132.

https://doi.org/10.15407/pcmm2025.06.126

Abstract

The effect of rapid cooling during melt deformation on the structure of hypereutectic Al–16.5% Si alloy, the elements of which are highly dispersed phases and primary silicon crystals of specific morphology, is studied. Under the synergistic action of local melt deformation and high cooling rates, the mechanism of crystal nucleation and growth changes. During eutectic decomposition of the liquid, atypical silicon dendrites with three branches in the form of plates with a thickness of 40 nm to 300 nm are formed, which are located at an angle of 120° to each other, and originate from the habit plane growing from the close-packed {111} planes of primary silicon crystals. Spherulites with morphological features of both primary and eutectic phases are identified for the first time. The formed structure provides the prerequisites for obtaining a material with unique physicomechanical properties, typical of metals and alloys with submicrocrystalline and nanosized structural components.

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