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<p>The hybrid metal matrix composites synthesized in the current research were fabricated using liquid stir-casting to achieve dispersion of the reinforcements. The composite specimens were fabricated using four weight ratios viz., 2&#xa0;wt% SiC + 8&#xa0;wt% B₄C, 4&#xa0;wt% SiC + 6&#xa0;wt% B₄C, 6&#xa0;wt% SiC + 4&#xa0;wt% B₄C, 8&#xa0;wt% SiC + 2&#xa0;wt% B₄C respectively. The fabricated composite specimens’ mechanical and tribological behavior were assessed. The mechanical characterization included tensile, and hardness properties, while the wear characterization were accomplished at different loads (10–60&#xa0;N) and at the same rate of sliding (2&#xa0;m/s) over a sliding distance range of 1000&#xa0;m to 5000&#xa0;m. These results indicate a steady decrease in the wear rate with the increase of the SiC content, i.e., the lowest wear rate of 3.2 × 10<sup>−4</sup> mm<sup>3</sup>/m was observed in the 8 wt% SiC + 2 wt% B4C composite specimens. Subsequently the SEM analysis of worn surfaces were accomplished. The SEM observations showed that the abrasive wear was mostly dominant at lower loads, while the higher loads encouraged micro-ploughing, particle pull-out and delamination processes. The hybrid reinforcement resulted in a great increase in hardness and load bearing capacity leading to a better tribological performance. This result suggests the existence of an optimal SiC/B<sub>4</sub>C ratio that will enhance the wear resistance. Thus, the composite specimens with optimum reinforcement ratios provides greater scope for its applications in real time components requiring tribological and mechanical advancements which is the major novelty of the current work.</p> Graphical Abstract <p></p>

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Evaluation of Mechanical and Tribological Properties of Hybrid-Composites (Al6061 + SiC + B4C)

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • M. S. Ashok Kumar,
  • D. Shivaprasad,
  • M. Ramakrishnaiah,
  • N. Santhosh,
  • Md. Amir Khan,
  • Aseel Smerat

摘要

The hybrid metal matrix composites synthesized in the current research were fabricated using liquid stir-casting to achieve dispersion of the reinforcements. The composite specimens were fabricated using four weight ratios viz., 2 wt% SiC + 8 wt% B₄C, 4 wt% SiC + 6 wt% B₄C, 6 wt% SiC + 4 wt% B₄C, 8 wt% SiC + 2 wt% B₄C respectively. The fabricated composite specimens’ mechanical and tribological behavior were assessed. The mechanical characterization included tensile, and hardness properties, while the wear characterization were accomplished at different loads (10–60 N) and at the same rate of sliding (2 m/s) over a sliding distance range of 1000 m to 5000 m. These results indicate a steady decrease in the wear rate with the increase of the SiC content, i.e., the lowest wear rate of 3.2 × 10−4 mm3/m was observed in the 8 wt% SiC + 2 wt% B4C composite specimens. Subsequently the SEM analysis of worn surfaces were accomplished. The SEM observations showed that the abrasive wear was mostly dominant at lower loads, while the higher loads encouraged micro-ploughing, particle pull-out and delamination processes. The hybrid reinforcement resulted in a great increase in hardness and load bearing capacity leading to a better tribological performance. This result suggests the existence of an optimal SiC/B4C ratio that will enhance the wear resistance. Thus, the composite specimens with optimum reinforcement ratios provides greater scope for its applications in real time components requiring tribological and mechanical advancements which is the major novelty of the current work.

Graphical Abstract