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<p>The present study employed a two-stage stir casting method to produce Al7075 metal matrix composites reinforced with boron carbide (B₄C), zirconium dioxide (ZrO₂), and graphite (Gr) particles each at a concentration of 3 wt%. The significance of each reinforcement on the mechanical and tribological behaviour of Al7075 was evaluated. Microstructural characterization and elemental composition were assessed using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The mechanical properties, such as hardness, ultimate tensile strength (UTS), elongation, yield strength and the wear behavior of Al7075 metal matrix composites (MMCs) were evaluated. It is found that the incorporation of ZrO₂, B₄C, and Gr has significantly improved the hardness, tensile and wear properties. The Al7075 composite reinforced with 3 wt% B₄C achieved the highest UTS of 243<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:\pm\:\)</EquationSource> </InlineEquation>3 MPa, representing a 13.44% increase over the base alloy. Whereas the Gr incorporation attained higher elongation. The hardness increased to 15% with B<sub>4</sub>C reinforcement compared to as cast Al7075 and wear resistance for Gr reinforcement increased to 6.2% compared to as cast Al7075 at a load of 40&#xa0;N and speed of 400&#xa0;rpm.</p>

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Mechanical, Fractographic and Tribological Behaviour of Al7075 Aluminium Alloy Reinforced with B₄C, Gr, and ZrO₂ Produced Using a Two-Stage Stir Casting Method

  • 期刊论文

  • 发表日期：

    2026年2月10日

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  • R Sampath Kumar,
  • H. C. Chittappa,
  • Manjunath Vatnalmath,
  • Madeva Nagaral,
  • V. Bharath,
  • Virupaxi Auradi

摘要

The present study employed a two-stage stir casting method to produce Al7075 metal matrix composites reinforced with boron carbide (B₄C), zirconium dioxide (ZrO₂), and graphite (Gr) particles each at a concentration of 3 wt%. The significance of each reinforcement on the mechanical and tribological behaviour of Al7075 was evaluated. Microstructural characterization and elemental composition were assessed using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The mechanical properties, such as hardness, ultimate tensile strength (UTS), elongation, yield strength and the wear behavior of Al7075 metal matrix composites (MMCs) were evaluated. It is found that the incorporation of ZrO₂, B₄C, and Gr has significantly improved the hardness, tensile and wear properties. The Al7075 composite reinforced with 3 wt% B₄C achieved the highest UTS of 243 \(\:\pm\:\) 3 MPa, representing a 13.44% increase over the base alloy. Whereas the Gr incorporation attained higher elongation. The hardness increased to 15% with B4C reinforcement compared to as cast Al7075 and wear resistance for Gr reinforcement increased to 6.2% compared to as cast Al7075 at a load of 40 N and speed of 400 rpm.