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<p>The present research aims to reduce casting defects and enrich the functional properties of magnesium alloy (AZ91E) composites with hybrid reinforcements, including silicon carbide nanoparticles (SiC) and carbon nanotube (CNT) fibers, through a liquid stir casting process associated with vacuum die casting. The final composite contained 5 vol% of CNT and 2-6 vol% of SiC nanoparticles. The influence of processing with SiC/CNT combinations on the surface morphology of the composite was analyzed using transmission electron microscopy (TEM), revealing that SiC and CNTs were widely dispersed throughout the AZ91E alloy matrix, resulting in a significant enhancement in mechanical properties. The AZ91E hybrid nanocomposite composed of 5 vol% CNT and 6 vol% SiC nanoparticles demonstrated enhanced tensile strength (213 MPa), impact toughness (15.1 J/mm<sup>2</sup>), microhardness (101 HV), and fracture toughness (16.2 MPa<sup>0.5</sup>), all of which are superior to those of the as-cast AZ91E alloy. Due to these improved properties, the AZ91E/5 vol% CNT/6 vol% SiC hybrid nanocomposite is suggested as a potential candidate for automotive structural applications.</p>

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Vacuum Aided Stir Cast Processing and Hybrid Reinforcement Actions on Functional Characteristics of Magnesium Alloy Composite

  • 期刊论文

  • 发表日期：

    2026年1月15日

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  • M. Aruna,
  • N. Nagabhooshanam,
  • Pragati Gajbhiye,
  • Shivakrishna Dasi,
  • B. Angel,
  • L. Divakara Rao,
  • Ramya Maranan,
  • M. Murali,
  • S. Sathiyamurthy

摘要

The present research aims to reduce casting defects and enrich the functional properties of magnesium alloy (AZ91E) composites with hybrid reinforcements, including silicon carbide nanoparticles (SiC) and carbon nanotube (CNT) fibers, through a liquid stir casting process associated with vacuum die casting. The final composite contained 5 vol% of CNT and 2-6 vol% of SiC nanoparticles. The influence of processing with SiC/CNT combinations on the surface morphology of the composite was analyzed using transmission electron microscopy (TEM), revealing that SiC and CNTs were widely dispersed throughout the AZ91E alloy matrix, resulting in a significant enhancement in mechanical properties. The AZ91E hybrid nanocomposite composed of 5 vol% CNT and 6 vol% SiC nanoparticles demonstrated enhanced tensile strength (213 MPa), impact toughness (15.1 J/mm2), microhardness (101 HV), and fracture toughness (16.2 MPa0.5), all of which are superior to those of the as-cast AZ91E alloy. Due to these improved properties, the AZ91E/5 vol% CNT/6 vol% SiC hybrid nanocomposite is suggested as a potential candidate for automotive structural applications.