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<p>The development of lightweight, high-strength materials with superior mechanical and thermal properties is crucial for aerospace, automotive, and structural applications. This study investigates the thermomechanical and microstructural behavior of a novel AA8011-based hybrid composite reinforced with boron carbide (B<sub>4</sub>C) and reduced graphene oxide (rGO). The composites were fabricated using a bottom-pour stir casting process, with reinforcement loadings varied from 3&#xa0;wt.% to 9&#xa0;wt.% B<sub>4</sub>C and 2–6 wt.% rGO. Microstructural analysis using SEM, EDS, and TEM confirmed uniform dispersion of rGO and effective interfacial bonding with the matrix, while localized B<sub>4</sub>C agglomeration was observed at higher loadings. Mechanical characterization revealed significant improvements: microhardness increased by 35%, tensile strength by 28% (210&#xa0;MPa), flexural strength reached 497&#xa0;MPa, and impact strength by 23% for the optimal composition containing 9 wt.% B<sub>4</sub>C and 2 wt.% rGO. These enhancements are attributed to grain refinement, Orowan strengthening, and efficient load transfer mechanisms facilitated by the dual reinforcement system. The developed composites demonstrate strong potential for high-performance engineering applications where strength, stiffness, and durability are critical.</p>

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Mechanical and Microstructural Property Characterization of Hybrid Aluminum AA8011/B4C/rGO Composites

  • 期刊论文

  • 发表日期：

    2025年10月20日

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  • Arun Michael,
  • J. Edwin Raja Dhas,
  • K. Anton Savio Lewise

摘要

The development of lightweight, high-strength materials with superior mechanical and thermal properties is crucial for aerospace, automotive, and structural applications. This study investigates the thermomechanical and microstructural behavior of a novel AA8011-based hybrid composite reinforced with boron carbide (B4C) and reduced graphene oxide (rGO). The composites were fabricated using a bottom-pour stir casting process, with reinforcement loadings varied from 3 wt.% to 9 wt.% B4C and 2–6 wt.% rGO. Microstructural analysis using SEM, EDS, and TEM confirmed uniform dispersion of rGO and effective interfacial bonding with the matrix, while localized B4C agglomeration was observed at higher loadings. Mechanical characterization revealed significant improvements: microhardness increased by 35%, tensile strength by 28% (210 MPa), flexural strength reached 497 MPa, and impact strength by 23% for the optimal composition containing 9 wt.% B4C and 2 wt.% rGO. These enhancements are attributed to grain refinement, Orowan strengthening, and efficient load transfer mechanisms facilitated by the dual reinforcement system. The developed composites demonstrate strong potential for high-performance engineering applications where strength, stiffness, and durability are critical.