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<p>This study investigates the mechanical, tribological, microstructural, and physical characteristics of Al7075–Si<sub>3</sub>N<sub>4</sub> composites reinforced with Si<sub>3</sub>N<sub>4</sub> particles derived from red matta rice husk. Four composite specimens B1, B2, B3, and B4 were developed with reinforcement levels of 1 vol%, 3 vol%, and 5 vol%, respectively. The results reveal that specimen B3 exhibits the most outstanding mechanical performance, with a tensile strength of 567&#xa0;MPa, compression strength of 581&#xa0;MPa, impact energy of 24.3&#xa0;J, and hardness of 179 VHN. These improvements are attributed to the optimal 3 vol% reinforcement, which ensures uniform particle dispersion, strong particle–matrix bonding, and effective obstruction of dislocation motion. Specimen B4, containing 5 vol% Si<sub>3</sub>N<sub>4</sub>, demonstrates superior wear resistance and physical characteristics, recording the lowest specific wear rate of 0.0096&#xa0;mm<sub>3</sub>/Nm, the lowest COF of 0.47, and improved density–porosity behavior with a density of 0.81&#xa0;g/cm<sub>3</sub> and porosity of 0.93%. The enhanced performance of B4 is due to the dominance of hard ceramic phases, the development of a protective tribo-layer, and structural refinement supported by higher reinforcement content. Microstructural and SEM analyses further confirm the progressive improvement from B1 to B4, showing reduction in voids, enhanced matrix densification, improved interfacial bonding, and uniform particle distribution up to 3 vol% reinforcement, followed by minor agglomeration at 5 vol%. Overall, the study establishes that 3 vol% Si<sub>3</sub>N<sub>4</sub> reinforcement optimally enhances mechanical properties, while 5 vol% reinforcement provides maximum tribological and density–porosity benefits, making the composites suitable for high-strength and wear-critical applications.</p>

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Development and characterization analysis of AA7075 metal matrix composite incorporated with red matta rice husk derived Si3N4 particles

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • C. Sravanthi,
  • Pratibha Dharmavarapu,
  • P. Bhargavi,
  • Sreeram Reddy Gundeti,
  • Udayani Kotagiri

摘要

This study investigates the mechanical, tribological, microstructural, and physical characteristics of Al7075–Si3N4 composites reinforced with Si3N4 particles derived from red matta rice husk. Four composite specimens B1, B2, B3, and B4 were developed with reinforcement levels of 1 vol%, 3 vol%, and 5 vol%, respectively. The results reveal that specimen B3 exhibits the most outstanding mechanical performance, with a tensile strength of 567 MPa, compression strength of 581 MPa, impact energy of 24.3 J, and hardness of 179 VHN. These improvements are attributed to the optimal 3 vol% reinforcement, which ensures uniform particle dispersion, strong particle–matrix bonding, and effective obstruction of dislocation motion. Specimen B4, containing 5 vol% Si3N4, demonstrates superior wear resistance and physical characteristics, recording the lowest specific wear rate of 0.0096 mm3/Nm, the lowest COF of 0.47, and improved density–porosity behavior with a density of 0.81 g/cm3 and porosity of 0.93%. The enhanced performance of B4 is due to the dominance of hard ceramic phases, the development of a protective tribo-layer, and structural refinement supported by higher reinforcement content. Microstructural and SEM analyses further confirm the progressive improvement from B1 to B4, showing reduction in voids, enhanced matrix densification, improved interfacial bonding, and uniform particle distribution up to 3 vol% reinforcement, followed by minor agglomeration at 5 vol%. Overall, the study establishes that 3 vol% Si3N4 reinforcement optimally enhances mechanical properties, while 5 vol% reinforcement provides maximum tribological and density–porosity benefits, making the composites suitable for high-strength and wear-critical applications.