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<p>Liquid-state processing is well established for magnesium alloy composite fabrication due to its distinct properties, which are suitable for complex designs at economic, efficient, and large-scale production. However, voids due to air entrapment, agglomeration, and particle settling during this process limit the overall composite characteristics. Presently, the vacuum-assisted stir-casting process is adopted to synthesize the AZ91 magnesium alloy hybrid composite using nano alumina particles (30–50&#xa0;nm, Al<sub>2</sub>O<sub>3</sub>) and carbon nanotubes (CNTs) at a rated stir speed under argon degassing conditions to overcome the difficulties encountered with the conventional stir-casting process. Using microstructural analysis, the casting defects in vacuum-assisted stir-cast AZ composites are examined, revealing a fine-grained structure with uniform reinforcements. It exhibits superior functional properties compared to the monolithic AZ91 cast. An optimum ultimate tensile stress of 310&#xa0;MPa, Young’s modulus of 58&#xa0;GPa, impact toughness of 85&#xa0;kJ/m<sup>2</sup>, Vickers hardness number of 91&#xa0;HV0.1, and the lowest porosity percentage of 0.52% are noted by the composition of AZ91/3&#xa0;wt% CNT/5 wt% alumina, which is a trade-off bicycle frame.</p>

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Vacuum-Assisted Casting Process of Alumina-Carbon Nanotube-Embedded Magnesium Alloy Composite Production and Performance Evaluation

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • Barun Haldar,
  • V. Geethalakshmi,
  • Srinivas Tadepalli,
  • T. Johnpeter,
  • Itha Veeranjaneyulu,
  • R. Venkatesh,
  • S. Sathiyamurthy,
  • Ramya Maranan

摘要

Liquid-state processing is well established for magnesium alloy composite fabrication due to its distinct properties, which are suitable for complex designs at economic, efficient, and large-scale production. However, voids due to air entrapment, agglomeration, and particle settling during this process limit the overall composite characteristics. Presently, the vacuum-assisted stir-casting process is adopted to synthesize the AZ91 magnesium alloy hybrid composite using nano alumina particles (30–50 nm, Al2O3) and carbon nanotubes (CNTs) at a rated stir speed under argon degassing conditions to overcome the difficulties encountered with the conventional stir-casting process. Using microstructural analysis, the casting defects in vacuum-assisted stir-cast AZ composites are examined, revealing a fine-grained structure with uniform reinforcements. It exhibits superior functional properties compared to the monolithic AZ91 cast. An optimum ultimate tensile stress of 310 MPa, Young’s modulus of 58 GPa, impact toughness of 85 kJ/m2, Vickers hardness number of 91 HV0.1, and the lowest porosity percentage of 0.52% are noted by the composition of AZ91/3 wt% CNT/5 wt% alumina, which is a trade-off bicycle frame.