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<p>AZ31 is a widely used magnesium alloy recognized for its strength, ductility, and corrosion resistance. The AZ31/ZrO<sub>2</sub> composite studied is produced through liquid stir casting, a process that can pose challenges such as poor wettability, the formation of an oxide layer, and the settling of nanoparticles. These issues can adversely affect the performance of the composite being produced. This research aims to achieve meticulous control of the AZ31 alloy composite melt within a potassium fluoride (KF) and inert argon (Ar) environment, with a uniform stir speed created in a semi-solid state. The study enhances the functional behaviour of the AZ31 alloy composite by incorporating zirconium dioxide (ZrO<sub>2</sub>) at 2&#xa0;wt% and silicon nitride (Si<sub>3</sub>N<sub>4</sub>) at 1–5&#xa0;wt% through the stir casting process associated with a gravity die-cast with a 1X10<sup>5</sup>pa of applied vacuum and constant stir speed (400rpm) is followed. The effects of 1&#xa0;wt% KF, Ar, and stir speed on the microstructural behaviour of the AZ31 alloy and its composites are analysed using a THERMOFISHER-TALOS F200X transmission electron microscope. Results show a homogeneous dispersion of particles without agglomeration/porosity. The grain size has been reduced dendritically, with an optimal grain size of 24&#xa0;µm observed in the AZ31/2&#xa0;wt% ZrO<sub>2</sub>/5&#xa0;wt% Si<sub>3</sub>N<sub>4</sub> hybrid nanocomposite. The impact of the Si<sub>3</sub>N<sub>4</sub> content on density, porosity, and mechanical properties has been evaluated. The AZ31/2wt% ZrO<sub>2</sub>/5wt% Si<sub>3</sub>N<sub>4</sub> hybrid nanocomposite demonstrates significant improvements in density, a reduction in porosity (less than 1%), and enhanced mechanical properties, including microhardness (94&#xa0;HV), Charpy impact toughness (16&#xa0;J/mm<sup>2</sup>), and yield/tensile strength (180&#xa0;MPa/343&#xa0;MPa). This composite is proposed for use in bicycle frame applications.</p>

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Vacuum Die Casting Process and Microstructure/Mechanical Characteristics Study of Magnesium Alloy Composite Hybridize with Zirconium Dioxide and Silicon Nitride

  • 期刊论文

  • 发表日期：

    2025年3月18日

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  • M. Aruna,
  • H. Ramakrishnan,
  • S. Prabagaran,
  • N. Kavitha,
  • R. Venkatesh,
  • N. Parthipan,
  • Vinayagam Mohanavel,
  • Manzoore Elahi M. Soudagar,
  • Sami Al Obaid,
  • Sulaiman Ali Alharbi

摘要

AZ31 is a widely used magnesium alloy recognized for its strength, ductility, and corrosion resistance. The AZ31/ZrO2 composite studied is produced through liquid stir casting, a process that can pose challenges such as poor wettability, the formation of an oxide layer, and the settling of nanoparticles. These issues can adversely affect the performance of the composite being produced. This research aims to achieve meticulous control of the AZ31 alloy composite melt within a potassium fluoride (KF) and inert argon (Ar) environment, with a uniform stir speed created in a semi-solid state. The study enhances the functional behaviour of the AZ31 alloy composite by incorporating zirconium dioxide (ZrO2) at 2 wt% and silicon nitride (Si3N4) at 1–5 wt% through the stir casting process associated with a gravity die-cast with a 1X105pa of applied vacuum and constant stir speed (400rpm) is followed. The effects of 1 wt% KF, Ar, and stir speed on the microstructural behaviour of the AZ31 alloy and its composites are analysed using a THERMOFISHER-TALOS F200X transmission electron microscope. Results show a homogeneous dispersion of particles without agglomeration/porosity. The grain size has been reduced dendritically, with an optimal grain size of 24 µm observed in the AZ31/2 wt% ZrO2/5 wt% Si3N4 hybrid nanocomposite. The impact of the Si3N4 content on density, porosity, and mechanical properties has been evaluated. The AZ31/2wt% ZrO2/5wt% Si3N4 hybrid nanocomposite demonstrates significant improvements in density, a reduction in porosity (less than 1%), and enhanced mechanical properties, including microhardness (94 HV), Charpy impact toughness (16 J/mm2), and yield/tensile strength (180 MPa/343 MPa). This composite is proposed for use in bicycle frame applications.