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<p>LM26 is one of the widely used aluminum-silicon casting alloy family because it possesses impressive qualities, which make it essential in many technical applications. The high silicon concentration promotes excellent fluidity during casting, enabling fabrication of complex designs. However, challenges are faced related to mechanical properties, dispersion consistency, and adhesion. This study investigates the influence of Multi-Wall Carbon Nanotubes (MWCNTs) on the LM26 aluminum alloy. MWCNT-reinforced LM26 composite samples with varying weight percentages of MWCNTs (0.25%, 0.5%, and 0.75%) were cast using the stir-casting technique at 700&#xa0;°C with a stirring speed of 650&#xa0;rpm. The composites were analyzed using Energy-Dispersive X-ray Analysis and Field Emission Scanning Electron Microscopy for microstructural characterization to examine grain reinforcement, particle distribution, and interfacial characteristics. Mechanical properties, such as tensile strength, Young’s modulus and impact, were examined in accordance with ASTM standards. The results demonstrate a significant improvement in the mechanical properties of the 0.25% MWCNT-reinforced LM26 composite. However, excessive reinforcement with MWCNT led to agglomeration and deterioration of properties. The 0.25% MWCNT + LM26 composite had a high ultimate tensile strength of 267.94&#xa0;MPa, Young’s modulus of 34.763 GPa. In the impact, 2.3&#xa0;J was observed as the maximum impact energy. To provide useful information for scalable fabrication, this experiment establishes relationships among the stir-casting parameters, the quality of the nanotube dispersion, and the structure and properties of the LM26/MWCNT composites. Thus, the results can bridge the gap between researchers and the industrial use of aluminum composite materials incorporating nanotubes.</p>

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Microstructural characterization and investigation on mechanical properties of stir cast hybrid LM26/MWCNT composites

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月28日

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  • Endalkachew Mosisa Gutema,
  • Mahesh Gopal,
  • Hirpa G. Lemu

摘要

LM26 is one of the widely used aluminum-silicon casting alloy family because it possesses impressive qualities, which make it essential in many technical applications. The high silicon concentration promotes excellent fluidity during casting, enabling fabrication of complex designs. However, challenges are faced related to mechanical properties, dispersion consistency, and adhesion. This study investigates the influence of Multi-Wall Carbon Nanotubes (MWCNTs) on the LM26 aluminum alloy. MWCNT-reinforced LM26 composite samples with varying weight percentages of MWCNTs (0.25%, 0.5%, and 0.75%) were cast using the stir-casting technique at 700 °C with a stirring speed of 650 rpm. The composites were analyzed using Energy-Dispersive X-ray Analysis and Field Emission Scanning Electron Microscopy for microstructural characterization to examine grain reinforcement, particle distribution, and interfacial characteristics. Mechanical properties, such as tensile strength, Young’s modulus and impact, were examined in accordance with ASTM standards. The results demonstrate a significant improvement in the mechanical properties of the 0.25% MWCNT-reinforced LM26 composite. However, excessive reinforcement with MWCNT led to agglomeration and deterioration of properties. The 0.25% MWCNT + LM26 composite had a high ultimate tensile strength of 267.94 MPa, Young’s modulus of 34.763 GPa. In the impact, 2.3 J was observed as the maximum impact energy. To provide useful information for scalable fabrication, this experiment establishes relationships among the stir-casting parameters, the quality of the nanotube dispersion, and the structure and properties of the LM26/MWCNT composites. Thus, the results can bridge the gap between researchers and the industrial use of aluminum composite materials incorporating nanotubes.