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<p>Hybrid magnesium metal matrix composites reinforced with silicon carbide (SiC) and aluminum nitride (AlN) were fabricated by spontaneous infiltration to evaluate the effect of AlN additions on the microstructure and hardness response of the AZ91E alloy. Ceramic preforms consisting of oxidized SiC and 5, 10, and 15 wt.% AlN were prepared and infiltrated with molten AZ91E under argon atmosphere. SEM and XRD analyses revealed complete infiltration and a stable distribution of SiC within the matrix, whereas AlN exhibited progressive agglomeration with increasing content. Vickers hardness (HV0.1) increased from 390.5 HV for the AZ91E/SiC composite to 513.2 HV for the hybrid composite containing 15 wt.% AlN. No interfacial reaction products were detected within the sensitivity limits of SEM and XRD. These results confirm that hybrid SiC–AlN reinforcement enhances the mechanical performance of AZ91E when processed by spontaneous infiltration.</p> Graphical abstract <p></p>

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Fabrication and characterization of AZ91E/SiC-xAlN hybrid metal matrix composites produced by spontaneous infiltration

  • 期刊论文

  • 发表日期：

    2025年12月11日

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  • J. Lemus-Ruiz,
  • V. S. López-Álvarez,
  • J. L. Cabezas‑Villa,
  • J. Reyes-Gasga

摘要

Hybrid magnesium metal matrix composites reinforced with silicon carbide (SiC) and aluminum nitride (AlN) were fabricated by spontaneous infiltration to evaluate the effect of AlN additions on the microstructure and hardness response of the AZ91E alloy. Ceramic preforms consisting of oxidized SiC and 5, 10, and 15 wt.% AlN were prepared and infiltrated with molten AZ91E under argon atmosphere. SEM and XRD analyses revealed complete infiltration and a stable distribution of SiC within the matrix, whereas AlN exhibited progressive agglomeration with increasing content. Vickers hardness (HV0.1) increased from 390.5 HV for the AZ91E/SiC composite to 513.2 HV for the hybrid composite containing 15 wt.% AlN. No interfacial reaction products were detected within the sensitivity limits of SEM and XRD. These results confirm that hybrid SiC–AlN reinforcement enhances the mechanical performance of AZ91E when processed by spontaneous infiltration.

Graphical abstract