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<p>In this work, lightweight magnesium matrix composites reinforced with silicon carbide (SiC) were fabricated and characterized. The high surface tension of liquid magnesium limits the compatibility of magnesium alloys with advanced ceramic materials. However, the passive oxidation of SiC, which forms a SiO₂ surface layer, decreases the contact angle, improves wettability between the AZ91E alloy and SiC, and prevents the formation of undesirable phases such as aluminum carbide (Al₄C₃), which degrade the composite’s mechanical properties. The results show that passive oxidation of SiC at 1200&#xa0;°C for 2&#xa0;h enabled the fabrication of AZ91E matrix composites reinforced with SiC via pressureless infiltration. The SiO₂ surface layer formed by passive oxidation improved the affinity between the matrix and reinforcement, allowing complete infiltration of the magnesium alloy without residual porosity.</p> Graphical abstract <p>Fabrication of a metal matrix composite Mg-AZ91E/Sic by spontaneous infiltration.</p>

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Fabrication of a metal matrix composite Mg-AZ91E/SiC by spontaneous infiltration

  • 期刊论文

  • 发表日期：

    2024年12月31日

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  • V. S. López-Álvarez,
  • A. M. Garcia-Carrillo,
  • J. A. Cedillo-Meza,
  • J. Reyes-Gasga,
  • J. Lemus-Ruiz

摘要

In this work, lightweight magnesium matrix composites reinforced with silicon carbide (SiC) were fabricated and characterized. The high surface tension of liquid magnesium limits the compatibility of magnesium alloys with advanced ceramic materials. However, the passive oxidation of SiC, which forms a SiO₂ surface layer, decreases the contact angle, improves wettability between the AZ91E alloy and SiC, and prevents the formation of undesirable phases such as aluminum carbide (Al₄C₃), which degrade the composite’s mechanical properties. The results show that passive oxidation of SiC at 1200 °C for 2 h enabled the fabrication of AZ91E matrix composites reinforced with SiC via pressureless infiltration. The SiO₂ surface layer formed by passive oxidation improved the affinity between the matrix and reinforcement, allowing complete infiltration of the magnesium alloy without residual porosity.

Graphical abstract

Fabrication of a metal matrix composite Mg-AZ91E/Sic by spontaneous infiltration.