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<p>Present research aims to synthesis and increase the tribo-mechanical performance of magnesium (AZ91) alloy composites embedded with a fixed loading of 5&#xa0;µm molybdenum disulfide (MoS<sub>2</sub>) and 3–9&#xa0;wt.% of 50&#xa0;nm boron carbide (B<sub>4</sub>C) particles via an ultrasonic-aided stir-cast route under an inert atmosphere. The combined effect of hybrid reinforcements and processing on microstructure, mechanical, and wear characteristics of AZ91 alloy and its MoS<sub>2</sub>/B<sub>4</sub>C hybrid composites is evaluated. The scanning electron microscope-electron dispersive X-ray spectroscopy revealed a wide dispersion of MoS<sub>2</sub>/B<sub>4</sub>C particles in AZ91 matrix, which leads to better intrinsic properties. The AZ91 composite inclusion with 2&#xa0;wt.%MoS<sub>2</sub>/6&#xa0;wt.%B<sub>4</sub>C showed a lower porosity (1.1 %), marginal enhancements in density (1.90 g/cm<sup>3</sup>), improved hardness (89.5&#xa0;HV), superior tensile stress (294&#xa0;MPa), and marginal enhancement in elongation. Moreover, the excellence of B<sub>4</sub>C particles, the AZ91/2&#xa0;wt.% MoS<sub>2</sub>/6&#xa0;wt.% B<sub>4</sub>C composite has an optimum wear resistance and marginal reduction in coefficient of friction at a higher load (40&#xa0;N). Based on these results, the AZ91/2&#xa0;wt.% MoS<sub>2</sub>/6&#xa0;wt.% B<sub>4</sub>C is a trade-off for automotive structural parts applications.</p>

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Ultrasonic-Aided Semisolid Stir-Cast Processing and Nanoparticle Inclusive Actions on Tribo-Mechanical Behavior of Magnesium Alloy Hybrid Composite

  • 期刊论文

  • 发表日期：

    2026年1月13日

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  • M. Aruna,
  • C. Devanathan,
  • V. V. Murali Krishnam Raju,
  • A. Mohana Krishnan,
  • Gopal Kaliyaperumal,
  • S. Venkatesa Prabhu,
  • Ramya Maranan,
  • R. Srinivasan,
  • S. Sathiyamurthy

摘要

Present research aims to synthesis and increase the tribo-mechanical performance of magnesium (AZ91) alloy composites embedded with a fixed loading of 5 µm molybdenum disulfide (MoS2) and 3–9 wt.% of 50 nm boron carbide (B4C) particles via an ultrasonic-aided stir-cast route under an inert atmosphere. The combined effect of hybrid reinforcements and processing on microstructure, mechanical, and wear characteristics of AZ91 alloy and its MoS2/B4C hybrid composites is evaluated. The scanning electron microscope-electron dispersive X-ray spectroscopy revealed a wide dispersion of MoS2/B4C particles in AZ91 matrix, which leads to better intrinsic properties. The AZ91 composite inclusion with 2 wt.%MoS2/6 wt.%B4C showed a lower porosity (1.1 %), marginal enhancements in density (1.90 g/cm3), improved hardness (89.5 HV), superior tensile stress (294 MPa), and marginal enhancement in elongation. Moreover, the excellence of B4C particles, the AZ91/2 wt.% MoS2/6 wt.% B4C composite has an optimum wear resistance and marginal reduction in coefficient of friction at a higher load (40 N). Based on these results, the AZ91/2 wt.% MoS2/6 wt.% B4C is a trade-off for automotive structural parts applications.