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

doi:10.1007/s40962-025-01863-6

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

2026-01-13

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V. V. Murali Krishnam Raju

DOI：10.1007/s40962-025-01863-6

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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.

Keywords:

AZ91 alloy

boron carbide

characteristics

molybdenum disulfide production

surface morphology

ultrasonic-stir cast

wear

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

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