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<p>The present investigation is devoted to developing magnesium (Mg) matrix composites reinforced with zirconium dioxide (ZrO<sub>2</sub>) at concentrations of 2, 4, and 6 wt.% via powder metallurgy (PM). While magnesium composites are promising for lightweight and biomedical applications, their rapid corrosion and reduced mechanical strength remain challenging due to inconsistent bonding between the reinforcement and the base matrix. Every composite specimen had been subjected to ball-milling in a cylindrical planetary ball mill at a speed of rotation of 120 rpm for a duration of 3 hours. Using a hydraulic press, the ball-milled powders were compressed. These compacts were then sintered in an argon atmosphere maintained at 400°C. The ball-milled powders were examined by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). The XRD analysis of the ball-milled powders confirmed the absence of intermetallic compounds. The sintered composite materials were evaluated for microhardness and compressive strength (CpS). For the 6 wt.% ZrO<sub>2</sub> sample, compressive strength peaked at 157 MPa and hardness reached 57.9 HV, the highest values recorded. This composition also yielded the lowest corrosion rate (0.065 mm/year).</p>

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Influence of ZrO2 Reinforcement on Microstructure and Mechanical Behaviour of Magnesium Composites Synthesized by Powder Metallurgy

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • M. Thilak,
  • S. Jayasathyakawin,
  • M. Ravichandran,
  • G. Paulraj

摘要

The present investigation is devoted to developing magnesium (Mg) matrix composites reinforced with zirconium dioxide (ZrO2) at concentrations of 2, 4, and 6 wt.% via powder metallurgy (PM). While magnesium composites are promising for lightweight and biomedical applications, their rapid corrosion and reduced mechanical strength remain challenging due to inconsistent bonding between the reinforcement and the base matrix. Every composite specimen had been subjected to ball-milling in a cylindrical planetary ball mill at a speed of rotation of 120 rpm for a duration of 3 hours. Using a hydraulic press, the ball-milled powders were compressed. These compacts were then sintered in an argon atmosphere maintained at 400°C. The ball-milled powders were examined by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). The XRD analysis of the ball-milled powders confirmed the absence of intermetallic compounds. The sintered composite materials were evaluated for microhardness and compressive strength (CpS). For the 6 wt.% ZrO2 sample, compressive strength peaked at 157 MPa and hardness reached 57.9 HV, the highest values recorded. This composition also yielded the lowest corrosion rate (0.065 mm/year).