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<p>Uniform distribution of carbon fiber in aluminum matrix is a challenge. The current work investigated various mixing techniques (ball milling, 3D mixing, surfactant-assisted mixing and mixing in toluene) of powder metallurgy route to fabricate the milled (MCF)-and short carbon fiber (SCF)-reinforced aluminum composite. Powder metallurgy route was adopted to process the aluminum composite at relatively low temperature to suppress the formation of brittle intermetallic phase of aluminum carbide (Al<sub>4</sub>C<sub>3</sub>) at fiber matrix interface. Excellent distribution of fibers, higher relative density and compressive strength were observed in the MCF-reinforced Al samples using toluene mixing technique. Using this mixing technique, the work was further extended to synthesize un-coated and coated (nickel and copper) SCF-reinforced aluminum composite to study the effect of aspect ratio and coating. MCF-reinforced composites achieved only modest gains (yield strength at 0.2% offset was 23% higher, and compressive strength evaluated at 0.4 strain was improved by 7%) compared to pure aluminum, whereas un-coated SCF-reinforced composites gave high yield strength enhancement (128% rise) but negligible compressive strength increase of 0.8%. Copper-coated SCF-reinforced aluminum composite samples showed a significant improvement in compressive properties with yield strength 90% higher and compressive strength 72% higher, while nickel-coated SCF provided intermediate improvements (yield strength: + 67% and compressive strength: + 10%).</p>

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Effect of Mixing Techniques, Fiber Aspect Ratio and Fiber Coating on the Microstructure and Compressive Strength of Carbon Fiber-Reinforced Aluminum Composite

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Lalit Mohan Joshi,
  • Nikhil Rajendra Gorhe,
  • Sanjeev Saxena,
  • Sriram Sathaiah

摘要

Uniform distribution of carbon fiber in aluminum matrix is a challenge. The current work investigated various mixing techniques (ball milling, 3D mixing, surfactant-assisted mixing and mixing in toluene) of powder metallurgy route to fabricate the milled (MCF)-and short carbon fiber (SCF)-reinforced aluminum composite. Powder metallurgy route was adopted to process the aluminum composite at relatively low temperature to suppress the formation of brittle intermetallic phase of aluminum carbide (Al4C3) at fiber matrix interface. Excellent distribution of fibers, higher relative density and compressive strength were observed in the MCF-reinforced Al samples using toluene mixing technique. Using this mixing technique, the work was further extended to synthesize un-coated and coated (nickel and copper) SCF-reinforced aluminum composite to study the effect of aspect ratio and coating. MCF-reinforced composites achieved only modest gains (yield strength at 0.2% offset was 23% higher, and compressive strength evaluated at 0.4 strain was improved by 7%) compared to pure aluminum, whereas un-coated SCF-reinforced composites gave high yield strength enhancement (128% rise) but negligible compressive strength increase of 0.8%. Copper-coated SCF-reinforced aluminum composite samples showed a significant improvement in compressive properties with yield strength 90% higher and compressive strength 72% higher, while nickel-coated SCF provided intermediate improvements (yield strength: + 67% and compressive strength: + 10%).