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<p>This research focuses on the wear characteristics of nitrided Al7075-based hybrid composites reinforced with Al–5%Ti–1%B and Al₂O₃ particles. The composites were produced using the stir casting technique and then nitrided to improve their surface hardness and overall mechanical performance. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses verified the homogeneous dispersion of the reinforcement particles within the matrix, leading to refined microstructure and enhanced mechanical strength. Mechanical testing, including microhardness and dry sliding pin-on-disc wear experiments, showed that the surface hardness, tensile strength, and coefficient of friction improved by approximately 20%, 13.9%, and 12.5%, respectively, compared with the unreinforced Al7075 alloy. The enhanced performance was attributed to the combined effect of surface hardening due to nitriding and effective load transfer between the matrix and the evenly distributed ceramic reinforcements, which increased the composite’s resistance to wear and deformation. These results demonstrate that nitrided Al7075 hybrid composites possess the potential for use in aerospace, automotive, and material-handling components requiring superior wear resistance and mechanical reliability.</p>

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Microstructural Refinement and Property Enhancement in Nitrided Al7075 Hybrid Composites Reinforced with Al–Ti–B and Al₂O₃

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • M. Uday,
  • H. R. Vitala,
  • Vinayak Suryawanshi,
  • Sagarkumar J. Aswar

摘要

This research focuses on the wear characteristics of nitrided Al7075-based hybrid composites reinforced with Al–5%Ti–1%B and Al₂O₃ particles. The composites were produced using the stir casting technique and then nitrided to improve their surface hardness and overall mechanical performance. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses verified the homogeneous dispersion of the reinforcement particles within the matrix, leading to refined microstructure and enhanced mechanical strength. Mechanical testing, including microhardness and dry sliding pin-on-disc wear experiments, showed that the surface hardness, tensile strength, and coefficient of friction improved by approximately 20%, 13.9%, and 12.5%, respectively, compared with the unreinforced Al7075 alloy. The enhanced performance was attributed to the combined effect of surface hardening due to nitriding and effective load transfer between the matrix and the evenly distributed ceramic reinforcements, which increased the composite’s resistance to wear and deformation. These results demonstrate that nitrided Al7075 hybrid composites possess the potential for use in aerospace, automotive, and material-handling components requiring superior wear resistance and mechanical reliability.