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<p>This study investigates the enhancement of the liquid stir casting process for fabricating AZ91 magnesium alloy composites by incorporating 3 wt% nano-alumina (Al<sub>2</sub>O<sub>3</sub>) and varying additions (2–6 wt%) of nano-silicon carbide (SiC). To overcome challenges related to wettability and particle dispersion in the molten matrix, a magnesium fluoride (MgF<sub>2</sub>) wettability agent, an argon inert atmosphere, and ultrasonic treatment were introduced. Microstructural analysis using Transmission Electron Microscopy (TEM) confirmed uniform, agglomeration–free dispersion of the reinforcements. The effects of these process modifications on grain size, density, porosity, microhardness, impact toughness, and tensile strength were evaluated. The composite containing 3 wt% Al<sub>2</sub>O<sub>3</sub> and 6 wt% SiC exhibited the most favorable properties, with a refined grain size of 25 μm, a density of 1.946 g/cm³, porosity below 1%, microhardness of 98 HV, impact toughness of 16.4 J/mm², and tensile strength of 352 MPa. These results demonstrate that process enhancements significantly improve composite quality and performance, making the AZ91/3 wt% Al<sub>2</sub>O<sub>3</sub>/6 wt % SiC hybrid nanocomposite a promising candidate for high-performance applications such as sports bicycle frames.</p>

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Integration of Magnesium Fluoride and Nano Alumina–Silicon Carbide Actions on Properties of AZ91 Alloy Hybrid Nanocomposites

  • 期刊论文

  • 发表日期：

    2025年4月27日

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  • M. Aruna,
  • A. Mohana Krishnan,
  • Nagabhooshanam Nagarajan,
  • S. Prabagaran,
  • Venkatesh Rathinavelu,
  • N. Kavitha,
  • N. Parthipan,
  • Vinayagam Mohanavel,
  • Manzoore Elahi M. Soudagar,
  • Sami Al Obaid,
  • Sulaiman Ali Alharbi

摘要

This study investigates the enhancement of the liquid stir casting process for fabricating AZ91 magnesium alloy composites by incorporating 3 wt% nano-alumina (Al2O3) and varying additions (2–6 wt%) of nano-silicon carbide (SiC). To overcome challenges related to wettability and particle dispersion in the molten matrix, a magnesium fluoride (MgF2) wettability agent, an argon inert atmosphere, and ultrasonic treatment were introduced. Microstructural analysis using Transmission Electron Microscopy (TEM) confirmed uniform, agglomeration–free dispersion of the reinforcements. The effects of these process modifications on grain size, density, porosity, microhardness, impact toughness, and tensile strength were evaluated. The composite containing 3 wt% Al2O3 and 6 wt% SiC exhibited the most favorable properties, with a refined grain size of 25 μm, a density of 1.946 g/cm³, porosity below 1%, microhardness of 98 HV, impact toughness of 16.4 J/mm², and tensile strength of 352 MPa. These results demonstrate that process enhancements significantly improve composite quality and performance, making the AZ91/3 wt% Al2O3/6 wt % SiC hybrid nanocomposite a promising candidate for high-performance applications such as sports bicycle frames.