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<p>This study investigates the dry sliding wear behavior of an AA6061-based hybrid nanocomposite reinforced with 1-3 wt.% of self-lubricating graphene nanoplatelets (GNP) and load-bearing yttrium oxide (Y<sub>2</sub>O<sub>3</sub>) nanoparticles fabricated via the stir–squeeze casting technique. Wear tests were conducted as per ASTM G99 on a pin-on-disk tribometer under loads of 5, 10, 15, and 20 N at ambient temperature. SEM–EDS characterization confirmed uniform reinforcement dispersion and strong interfacial bonding in the fabricated nanocomposites, and revealed a load-dependent transition in wear mechanism from adhesive to mild abrasive and oxidative wear on worn surfaces. Among all compositions, the hybrid nanocomposite reinforced with 3 wt.% GNP and 3 wt.% Y<sub>2</sub>O<sub>3</sub> exhibited the best tribological performance, recording the minimal wear rate of 0.468 × 10<sup>−4</sup> mm<sup>3</sup>/N·m at 15 N and a 32.5% decrease in the coefficient of friction at 20 N compared with unreinforced AA6061. These results highlight the superior tribological behavior of GNP–Y<sub>2</sub>O<sub>3</sub>-reinforced AA6061 hybrid nanocomposites, making them promising materials applicable across aerospace and automotive sectors.</p>

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Dry Sliding Tribological Performance of AA6061 Hybrid Nanocomposites Reinforced with Self-Lubricating GNP and Load-Bearing Y2O3 Fabricated by Stir–Squeeze Casting

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Ashutosh Kumar,
  • Vikas Upadhyay,
  • Chaitanya Sharma

摘要

This study investigates the dry sliding wear behavior of an AA6061-based hybrid nanocomposite reinforced with 1-3 wt.% of self-lubricating graphene nanoplatelets (GNP) and load-bearing yttrium oxide (Y2O3) nanoparticles fabricated via the stir–squeeze casting technique. Wear tests were conducted as per ASTM G99 on a pin-on-disk tribometer under loads of 5, 10, 15, and 20 N at ambient temperature. SEM–EDS characterization confirmed uniform reinforcement dispersion and strong interfacial bonding in the fabricated nanocomposites, and revealed a load-dependent transition in wear mechanism from adhesive to mild abrasive and oxidative wear on worn surfaces. Among all compositions, the hybrid nanocomposite reinforced with 3 wt.% GNP and 3 wt.% Y2O3 exhibited the best tribological performance, recording the minimal wear rate of 0.468 × 10−4 mm3/N·m at 15 N and a 32.5% decrease in the coefficient of friction at 20 N compared with unreinforced AA6061. These results highlight the superior tribological behavior of GNP–Y2O3-reinforced AA6061 hybrid nanocomposites, making them promising materials applicable across aerospace and automotive sectors.