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<p>A hybrid magnesium matrix composite reinforced with aluminum, zinc, and multiple particulates was developed through liquid stir casting to enhance tribo-mechanical performance for potential applications in automotive housings and structural frames. However, conventional stir casting often results in reinforcement agglomeration, porosity due to gas entrapment and oxide formation, and non-uniform particle distribution, which limit composite performance. This study aims to enhance the functional characteristics of an AZ91 magnesium alloy by incorporating nanoscale silicon carbide (SiC, 50&#xa0;nm) and graphene (0.5 µm in length, 30 nm thick) as reinforcements. A vacuum-assisted stir casting process was employed, with a constant stirring rate and argon shielding to minimize oxidation and promote uniform dispersion of the material. The synthesized AZ91-based composite contained 0.5 wt.% graphene and 2–6 wt.% nano-SiC. The effects of vacuum-assisted casting and hybrid reinforcement on the microstructure (as observed via scanning electron microscopy), mechanical properties (including tensile strength, elongation, Vickers hardness, and energy absorption), and density/porosity were evaluated and compared with those of the unreinforced AZ91 alloy. Microstructural analysis revealed improved dispersion and interfacial bonding between SiC and graphene within the matrix under vacuum. The AZ91–0.5 wt.% graphene 6 wt.% SiC nanocomposite exhibited superior properties, including a tensile strength of 303 MPa, hardness of 105 HV, energy absorption of 13.7 J, and a reduced porosity level of 0.7%. These enhancements demonstrate the potential of the developed hybrid nanocomposite for applications like structural components in the automotive sector.</p>

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Enrichment of Surface Morphology and Mechanical Behaviour of Magnesium Alloy Composite Made With Hybrid Reinforcements Via Vacuum-Aided Stir Cast Process

  • 期刊论文

  • 发表日期：

    2025年11月16日

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  • Ramesh Dnyandeo Sul,
  • Nitin Kundlik,
  • Aman Sharma,
  • V. Muthuraman,
  • Sendil Kumar,
  • Nagabhooshanam Nagarajan,
  • BEVL Naidu,
  • Ramya Maranan,
  • T. Thirugnanasambandham

摘要

A hybrid magnesium matrix composite reinforced with aluminum, zinc, and multiple particulates was developed through liquid stir casting to enhance tribo-mechanical performance for potential applications in automotive housings and structural frames. However, conventional stir casting often results in reinforcement agglomeration, porosity due to gas entrapment and oxide formation, and non-uniform particle distribution, which limit composite performance. This study aims to enhance the functional characteristics of an AZ91 magnesium alloy by incorporating nanoscale silicon carbide (SiC, 50 nm) and graphene (0.5 µm in length, 30 nm thick) as reinforcements. A vacuum-assisted stir casting process was employed, with a constant stirring rate and argon shielding to minimize oxidation and promote uniform dispersion of the material. The synthesized AZ91-based composite contained 0.5 wt.% graphene and 2–6 wt.% nano-SiC. The effects of vacuum-assisted casting and hybrid reinforcement on the microstructure (as observed via scanning electron microscopy), mechanical properties (including tensile strength, elongation, Vickers hardness, and energy absorption), and density/porosity were evaluated and compared with those of the unreinforced AZ91 alloy. Microstructural analysis revealed improved dispersion and interfacial bonding between SiC and graphene within the matrix under vacuum. The AZ91–0.5 wt.% graphene 6 wt.% SiC nanocomposite exhibited superior properties, including a tensile strength of 303 MPa, hardness of 105 HV, energy absorption of 13.7 J, and a reduced porosity level of 0.7%. These enhancements demonstrate the potential of the developed hybrid nanocomposite for applications like structural components in the automotive sector.