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<p>The hybrid aluminium matrix composites (HAMCs) are commonly used in the aerospace and automotive industry, because of their high strength-to-weight ratio and excellent mechanical properties. In this study, Al7075 Hybrid composites were produced with the addition of Boron carbide (B4C) and Rice husk ash (RHA) fabricated by Stir casting method. The content of B4C varied between 0 and 15 wt% and the content of RHA was kept constant at 3 wt%. The fabricated composites were tested to check the tensile strength, hardness and microstructural characteristics. The study results indicated that with increasing B4C content, there were significant improvements in mechanical properties. The tensile strength of the composite (15 wt% B4C and 3 wt% RHA) was found to be 269.3&#xa0;MPa, which is higher than the tensile strength of the unreinforced alloy (120.2&#xa0;MPa), while the hardness of the composite was found to be 169 BHN, which is higher than the hardness of the unreinforced alloy (125 BHN). SEM analysis revealed good particle–matrix bonding with low porosity and reasonably uniform distribution of reinforcement particles. The manufactured composites are considered to be potential lightweight structural material for superior strength and hardness.</p>

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Investigation on mechanical behaviour of B4C and RHA reinforced AA7075 HAMC’s through stir casting methodology

  • 期刊论文

  • 发表日期：

    2026年6月27日

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  • T. Rajpradeesh,
  • R Naveen Raj,
  • K. Arunprasath

摘要

The hybrid aluminium matrix composites (HAMCs) are commonly used in the aerospace and automotive industry, because of their high strength-to-weight ratio and excellent mechanical properties. In this study, Al7075 Hybrid composites were produced with the addition of Boron carbide (B4C) and Rice husk ash (RHA) fabricated by Stir casting method. The content of B4C varied between 0 and 15 wt% and the content of RHA was kept constant at 3 wt%. The fabricated composites were tested to check the tensile strength, hardness and microstructural characteristics. The study results indicated that with increasing B4C content, there were significant improvements in mechanical properties. The tensile strength of the composite (15 wt% B4C and 3 wt% RHA) was found to be 269.3 MPa, which is higher than the tensile strength of the unreinforced alloy (120.2 MPa), while the hardness of the composite was found to be 169 BHN, which is higher than the hardness of the unreinforced alloy (125 BHN). SEM analysis revealed good particle–matrix bonding with low porosity and reasonably uniform distribution of reinforcement particles. The manufactured composites are considered to be potential lightweight structural material for superior strength and hardness.