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<p>This research examines the impact of brass reinforcement in AA2024 composites produced through FSP. AA2024 plates were processed with varying brass concentrations (2, 4, 6, and 8 wt.%) to evaluate their influence on grain refinement, reinforcement distribution, mechanical properties, and tribological performance. The findings indicate that brass reinforcement up to 4 wt.% effectively refines grain size (5.9&#xa0;µm) and enhances hardness and tensile strength due to efficient precipitation strengthening and uniform dispersion of Al₂Cu and MgZn₂ phases. However, excessive reinforcement at higher concentrations (6 and 8wt.%) leads to grain coarsening, precipitate dissolution, and clustering, compromising mechanical integrity and tribological performance. Wear analysis reveals that 4wt.% brass provides the best wear resistance and the lowest coefficient of friction, attributed to strong interfacial bonding and stable tribo-layer formation. As brass content increases, wear resistance declines due to severe abrasive wear and reinforcement detachment. The study concludes that 4wt.% brass reinforcement is the optimal composition for enhancing microstructural stability, mechanical strength, and wear resistance in FSPed AA2024 composites, making it a promising material for applications in the automotive and aerospace industries. </p>

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Microstructural Evolution and Tribological Performance of Friction Stir Processed AA2024-Brass Composites

  • 期刊论文

  • 发表日期：

    2025年5月12日

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  • Chinthakunta Siva Reddy,
  • P. Veera Sanjeeva Kumar

摘要

This research examines the impact of brass reinforcement in AA2024 composites produced through FSP. AA2024 plates were processed with varying brass concentrations (2, 4, 6, and 8 wt.%) to evaluate their influence on grain refinement, reinforcement distribution, mechanical properties, and tribological performance. The findings indicate that brass reinforcement up to 4 wt.% effectively refines grain size (5.9 µm) and enhances hardness and tensile strength due to efficient precipitation strengthening and uniform dispersion of Al₂Cu and MgZn₂ phases. However, excessive reinforcement at higher concentrations (6 and 8wt.%) leads to grain coarsening, precipitate dissolution, and clustering, compromising mechanical integrity and tribological performance. Wear analysis reveals that 4wt.% brass provides the best wear resistance and the lowest coefficient of friction, attributed to strong interfacial bonding and stable tribo-layer formation. As brass content increases, wear resistance declines due to severe abrasive wear and reinforcement detachment. The study concludes that 4wt.% brass reinforcement is the optimal composition for enhancing microstructural stability, mechanical strength, and wear resistance in FSPed AA2024 composites, making it a promising material for applications in the automotive and aerospace industries.