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<p>The effect of rapid cooling during melt deformation on the structure of the hypereutectic Al–16.5% Si alloy, which contains highly dispersed phases and primary silicon crystals of specific morphology, is studied. The mechanism of crystal nucleation and growth changes under the synergistic action of local melt deformation and high cooling rates. During eutectic decomposition of the liquid, atypical silicon dendrites with three branches in the form of plates with a&#xa0;thickness of 40 nm to 300 nm are formed, which are located at an angle of 120 degrees 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&#xa0;material with unique physico-mechanical properties, typical of metals and alloys with submicrocrystalline and nanosized structural components.</p>

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

  • 期刊论文

  • 发表日期：

    2026年7月17日

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  • A. G. Prygunova,
  • S. S. Petrov,
  • T. A. Aiupova,
  • S. V. Prygunov

摘要

The effect of rapid cooling during melt deformation on the structure of the hypereutectic Al–16.5% Si alloy, which contains highly dispersed phases and primary silicon crystals of specific morphology, is studied. The mechanism of crystal nucleation and growth changes under the synergistic action of local melt deformation and high cooling rates. 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 degrees 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 physico-mechanical properties, typical of metals and alloys with submicrocrystalline and nanosized structural components.