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<p>This research investigates the mechanical and tribological performance of Al7475-based metal matrix composites reinforced with ceramic particulates under dry and lubricated sliding conditions. Six composite formulations (A0–A5) were fabricated with varying reinforcement content and their tensile, flexural, impact, hardness, wear and friction characteristics were systematically evaluated and microstructural analysis was analysed using scanning electron microscopy (SEM). The results show that moderate reinforcement levels significantly enhance mechanical properties with composite A4, exhibiting the highest tensile strength (535&#xa0;MPa), flexural strength (740&#xa0;MPa) and impact strength (11.2&#xa0;J). Hardness increases consistently with reinforcement content, reaching a maximum of 168 BHN for A5. Tribological tests revealed that the dry wear rate decreased from 0.0068 mm<sup>3</sup>&#xa0;Nm<sup>−1</sup> for A0 to 0.0042 mm<sup>3</sup>&#xa0;Nm<sup>−1</sup> for A5 accompanied by a reduction in the coefficient of friction (COF) from 0.62 to 0.50. Under SAE 40 lubricated conditions, wear rates were further reduced to 0.0026 mm<sup>3</sup>&#xa0;Nm<sup>−1</sup> with a minimum friction coefficient of 0.11 for A5. The combined analysis indicates a strong correlation between increased hardness and reduced wear while excessive reinforcement marginally compromises impact resistance. Overall, composite A4 provides the most balanced combination of strength, toughness and tribological performance, making it a promising candidate for lubricated automotive and mechanical applications.</p>

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Effect of SiO2 and TiO2 additives on tribological performance of Al7475 matrix composites at SAE 40 lubricating conditions

  • 期刊论文

  • 发表日期：

    2026年4月16日

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  • I. Rahamathullah,
  • T. Jayakumar,
  • A. Kumaravadivel

摘要

This research investigates the mechanical and tribological performance of Al7475-based metal matrix composites reinforced with ceramic particulates under dry and lubricated sliding conditions. Six composite formulations (A0–A5) were fabricated with varying reinforcement content and their tensile, flexural, impact, hardness, wear and friction characteristics were systematically evaluated and microstructural analysis was analysed using scanning electron microscopy (SEM). The results show that moderate reinforcement levels significantly enhance mechanical properties with composite A4, exhibiting the highest tensile strength (535 MPa), flexural strength (740 MPa) and impact strength (11.2 J). Hardness increases consistently with reinforcement content, reaching a maximum of 168 BHN for A5. Tribological tests revealed that the dry wear rate decreased from 0.0068 mm3 Nm−1 for A0 to 0.0042 mm3 Nm−1 for A5 accompanied by a reduction in the coefficient of friction (COF) from 0.62 to 0.50. Under SAE 40 lubricated conditions, wear rates were further reduced to 0.0026 mm3 Nm−1 with a minimum friction coefficient of 0.11 for A5. The combined analysis indicates a strong correlation between increased hardness and reduced wear while excessive reinforcement marginally compromises impact resistance. Overall, composite A4 provides the most balanced combination of strength, toughness and tribological performance, making it a promising candidate for lubricated automotive and mechanical applications.