Microstructural changes in copper-graphite-alumina nanocomposites produced by mechanical alloying

Area of Science:

• Materials Science
• Nanotechnology
• Composite Materials

Background:

• Nanostructured materials offer enhanced properties.
• Copper-matrix composites are of interest for various applications.
• High-energy milling is a method for producing advanced materials.

Purpose of the Study:

• To investigate the microstructural evolution of nanostructured copper-matrix composites.
• To evaluate the effect of graphite and alumina addition on copper.
• To understand the influence of milling time on composite characteristics.

Main Methods:

• Planetary ball milling of copper-graphite-alumina and copper-graphite powders.
• Characterization using field emission gun scanning electron microscopy/energy-dispersive spectroscopy.
• Analysis via Raman spectroscopy, X-ray diffraction, and particle size analysis.

Main Results:

• Homogeneous distribution of graphite and alumina nanoparticles in the copper matrix was achieved.
• Copper crystallite size reduced to 15 nm after 16 h of milling.
• Milling media contamination increased significantly after 8 h.

Conclusions:

• Efficient dispersion and bonding of nanoparticles in the copper matrix were successful.
• The produced composites show promise for high conductivity, strength, and thermal stability.
• Optimized milling parameters are crucial for achieving desired microstructures and minimizing contamination.