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<p>In this study, aluminum–silicon (Al–Si) alloy was reinforced with fly ash and aluminum oxide (Al₂O₃) particles to fabricate aluminum matrix composites (AMCs) via a two-step stir casting technique. The reinforcement phase comprised of 2.5 vol.% Al₂O₃ (particle size: 60–80&#xa0;μm) in combination with fly ash particles (particle size: 40–60&#xa0;μm) at varying concentrations of 2.5, 5.0, 7.5, and 10 vol.%. The microstructural characterization has been carried out using scanning electron microscopy (SEM), and the formation of distinct compounds due to reaction in the elements of Al–Si alloy, Al₂O₃ and fly ash at high temperature during composite fabrication has been studied using X-ray diffraction (XRD) analysis. Thermogravimetric and differential thermal analysis (TGA–DTA) were carried out to study the weight loss behavior and endothermic heat capacity of the fabricated composites. Mechanical characterization of the composite has been carried out using the Brinell hardness test and the tensile test. The results highlight that the synergistic reinforcement of Al₂O₃ and fly ash can substantially enhance the thermal stability and mechanical performance of Al–Si alloys. These novel Al–Si/Al₂O₃/fly ash composites demonstrate strong potential for applications in automotive, aerospace, aeronautical, and marine industries, thereby offering a sustainable pathway for fly ash utilization.</p>

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Synergistic Reinforcement of Al2O3 and Fly Ash in Al–Si Alloys: Enhanced Thermal Stability and Mechanical Properties

  • 期刊论文

  • 发表日期：

    2026年5月28日

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  • Hukum Chand Dewangan,
  • Sunil Kumar Dewangan,
  • Rajesh Kumar Bhushan

摘要

In this study, aluminum–silicon (Al–Si) alloy was reinforced with fly ash and aluminum oxide (Al₂O₃) particles to fabricate aluminum matrix composites (AMCs) via a two-step stir casting technique. The reinforcement phase comprised of 2.5 vol.% Al₂O₃ (particle size: 60–80 μm) in combination with fly ash particles (particle size: 40–60 μm) at varying concentrations of 2.5, 5.0, 7.5, and 10 vol.%. The microstructural characterization has been carried out using scanning electron microscopy (SEM), and the formation of distinct compounds due to reaction in the elements of Al–Si alloy, Al₂O₃ and fly ash at high temperature during composite fabrication has been studied using X-ray diffraction (XRD) analysis. Thermogravimetric and differential thermal analysis (TGA–DTA) were carried out to study the weight loss behavior and endothermic heat capacity of the fabricated composites. Mechanical characterization of the composite has been carried out using the Brinell hardness test and the tensile test. The results highlight that the synergistic reinforcement of Al₂O₃ and fly ash can substantially enhance the thermal stability and mechanical performance of Al–Si alloys. These novel Al–Si/Al₂O₃/fly ash composites demonstrate strong potential for applications in automotive, aerospace, aeronautical, and marine industries, thereby offering a sustainable pathway for fly ash utilization.