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<p>Aluminum-based hybrid metal matrix composites (HMMCs) with discrete ceramic reinforced particles render a prodigious contribution to the current materials science exploration for lightweight and enhanced mechanical–tribological aspects in various automotive, avionics, constructional, manufacturing, and bio-medical fields. Therefore, neoteric comparative experimentation involves a monolithic Al-7075(T6)-based alloy (i.e., sample−0) embedded with two discrete combinations of reinforced particles (i.e., 4.5wt.% of Si<sub>3</sub>N<sub>4</sub> + 3.5wt.% of MoS<sub>2</sub> (i.e., sample−1) and 4.5wt.% of TiB<sub>2</sub> + 3.5wt.% of MoS<sub>2</sub> (i.e., sample−2)), respectively, and fabricated through an advanced stir casting process. Moreover, the mechanical properties (in terms of micro-hardness and tensile strength), and tribological properties (in terms of wear loss and coefficient of friction (CoF)) under dry sliding wear conditions on a pin-on-disk tribometer at an ambient temperature of 30 ± 5&#xa0;°C are determined. The experimental results of two discrete HMMCs as compared to sample−0 revealed a remarkable improvement in their micro-hardness (≈26.42% for sample−1 and ≈40.06% for sample−2) and tensile strength (≈18.12% for sample−1 and ≈27.05% for sample−2), whereas there is a drastic reduction in their wear loss (≈23.66% for sample−1 and ≈45.83% for sample−2) and CoF (≈37.70% for sample−1 and ≈54.10% for sample−2). Hence, it can be presumed that the percentage contribution of sample−2 shows dominant mechanical-tribo-philosophies over both remaining samples. Besides, the morphology of developed HMMCs with Si<sub>3</sub>N<sub>4</sub>/TiB<sub>2</sub>/MoS<sub>2</sub> particles is critically investigated via optical microscope and SEM techniques which further depict a homogeneous scattering over an Al-based metal matrix with a few deep groves and delamination of worn surfaces.</p>

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Mechanical-Tribo-Philosophies of Advanced Stir-Casted Al-7075(T6)-Based Hybrid Composite Embedded with Si3N4 + MoS2 and TiB2 + MoS2: A Neoteric Comparative Experimentation

  • 期刊论文

  • 发表日期：

    2025年2月11日

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  • Nikhilesh Singh,
  • Deepika

摘要

Aluminum-based hybrid metal matrix composites (HMMCs) with discrete ceramic reinforced particles render a prodigious contribution to the current materials science exploration for lightweight and enhanced mechanical–tribological aspects in various automotive, avionics, constructional, manufacturing, and bio-medical fields. Therefore, neoteric comparative experimentation involves a monolithic Al-7075(T6)-based alloy (i.e., sample−0) embedded with two discrete combinations of reinforced particles (i.e., 4.5wt.% of Si3N4 + 3.5wt.% of MoS2 (i.e., sample−1) and 4.5wt.% of TiB2 + 3.5wt.% of MoS2 (i.e., sample−2)), respectively, and fabricated through an advanced stir casting process. Moreover, the mechanical properties (in terms of micro-hardness and tensile strength), and tribological properties (in terms of wear loss and coefficient of friction (CoF)) under dry sliding wear conditions on a pin-on-disk tribometer at an ambient temperature of 30 ± 5 °C are determined. The experimental results of two discrete HMMCs as compared to sample−0 revealed a remarkable improvement in their micro-hardness (≈26.42% for sample−1 and ≈40.06% for sample−2) and tensile strength (≈18.12% for sample−1 and ≈27.05% for sample−2), whereas there is a drastic reduction in their wear loss (≈23.66% for sample−1 and ≈45.83% for sample−2) and CoF (≈37.70% for sample−1 and ≈54.10% for sample−2). Hence, it can be presumed that the percentage contribution of sample−2 shows dominant mechanical-tribo-philosophies over both remaining samples. Besides, the morphology of developed HMMCs with Si3N4/TiB2/MoS2 particles is critically investigated via optical microscope and SEM techniques which further depict a homogeneous scattering over an Al-based metal matrix with a few deep groves and delamination of worn surfaces.