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<p>Aluminum metal matrix composites (AMMCs) reinforced with carbon nanotubes (CNTs) offer promising improvements in mechanical and thermal performance. But achieving uniform CNT dispersion and stable interfacial bonding remains a major challenge. This study develops an Al-CNT composite using a controlled powder-metallurgy route combined with Cu-assisted reinforcement to enhance load transfer and microstructural stability. Optimized planetary ball milling was used to disperse CNTs in the concentration of 0.5 to 2 wt.%, and then, the material was subjected to hot compaction and sintering at 600&#xa0;°C. Optical microscopy, SEM, and EDS microstructural analysis proved successful refinement of the aluminum grains and even distribution of CNTs up to 1.5 wt.%. The composition produced the maximum Vickers hardness of 46.43 HV, which is a significant improvement compared to the base alloy. Thermal analysis demonstrated a weight loss of 600&#xa0;°C, and a constant endothermic peak at 720&#xa0;°C was observed without any intermetallic formation or degradation of CNTs. The reinforcement and interfacial activation mechanisms were integrated and played a significant role in enhancing the mechanical response and thermal stability of the composite. The results provide a reliable processing pathway for producing lightweight, thermally stable AMMCs suitable for advanced structural and thermal-management processes.</p>

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Processing, Characterization, and Thermal Analysis of Carbon Nanotube-Reinforced Aluminum Metal Matrix Composites

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • E. N. Sreekumar,
  • J. Yoganandh,
  • J. B. Sajin,
  • M. S. Senthil Saravanan

摘要

Aluminum metal matrix composites (AMMCs) reinforced with carbon nanotubes (CNTs) offer promising improvements in mechanical and thermal performance. But achieving uniform CNT dispersion and stable interfacial bonding remains a major challenge. This study develops an Al-CNT composite using a controlled powder-metallurgy route combined with Cu-assisted reinforcement to enhance load transfer and microstructural stability. Optimized planetary ball milling was used to disperse CNTs in the concentration of 0.5 to 2 wt.%, and then, the material was subjected to hot compaction and sintering at 600 °C. Optical microscopy, SEM, and EDS microstructural analysis proved successful refinement of the aluminum grains and even distribution of CNTs up to 1.5 wt.%. The composition produced the maximum Vickers hardness of 46.43 HV, which is a significant improvement compared to the base alloy. Thermal analysis demonstrated a weight loss of 600 °C, and a constant endothermic peak at 720 °C was observed without any intermetallic formation or degradation of CNTs. The reinforcement and interfacial activation mechanisms were integrated and played a significant role in enhancing the mechanical response and thermal stability of the composite. The results provide a reliable processing pathway for producing lightweight, thermally stable AMMCs suitable for advanced structural and thermal-management processes.