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Open AccessArticle

Investigating the Microstructure and Mechanical Properties of Aluminum-Matrix Reinforced-Graphene Nanosheet Composites Fabricated by Mechanical Milling and Equal-Channel Angular Pressing

1
Department of Materials Science and Engineering, Imam Khomeini International University (IKIU), Qazvin 3414916818, Iran
2
Department of Chemistry and Chemical Biology, McMaster University, Hamilton, ON L8S 4M1, Canada
3
Department of Physics of Materials, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, Praha 2 121 16, Czech Republic
4
Mechanical Engineering Department, Prince Mohammad Bin Fahd University, Al Khobar 31952, Saudi Arabia
5
Department of Mechanical Engineering, Imperial College London, London SW7, UK
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(8), 1070; https://doi.org/10.3390/nano9081070
Received: 21 June 2019 / Revised: 21 July 2019 / Accepted: 22 July 2019 / Published: 25 July 2019
Layered-graphene reinforced-metal matrix nanocomposites with excellent mechanical properties and low density are a new class of advanced materials for a broad range of applications. A facile three-step approach based on ultra-sonication for dispersion of graphene nanosheets (GNSs), ball milling for Al-powder mixing with different weight percentages of GNSs, and equal-channel angular pressing for powders’ consolidation at 200 °C was applied for nanocomposite fabrication. The Raman analysis revealed that the GNSs in the sample with 0.25 wt.% GNSs were exfoliated by the creation of some defects and disordering. X-ray diffraction and microstructural analysis confirmed that the interaction of the GNSs and the matrix was almost mechanical, interfacial bonding. The density test demonstrated that all samples except the 1 wt.% GNSs were fully densified due to the formation of microvoids, which were observed in the scanning electron microscope analysis. Investigation of the mechanical properties showed that by using Al powders with commercial purity, the 0.25 wt.% GNS sample possessed the maximum hardness, ultimate shear strength, and uniform normal displacement in comparison with the other samples. The highest mechanical properties were observed in the 0.25 wt.% GNSs composite, resulting from the embedding of exfoliated GNSs between Al powders, excellent mechanical bonding, and grain refinement. In contrast, agglomerated GNSs and the existence of microvoids caused deterioration of the mechanical properties in the 1 wt.% GNSs sample. View Full-Text
Keywords: aluminum matrix; graphene nanosheets; equal-channel angular pressing (ECAP); ball milling; mechanical properties; microstructure aluminum matrix; graphene nanosheets; equal-channel angular pressing (ECAP); ball milling; mechanical properties; microstructure
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MDPI and ACS Style

Hasanzadeh Azar, M.; Sadri, B.; Nemati, A.; Angizi, S.; Shaeri, M.H.; Minárik, P.; Veselý, J.; Djavanroodi, F. Investigating the Microstructure and Mechanical Properties of Aluminum-Matrix Reinforced-Graphene Nanosheet Composites Fabricated by Mechanical Milling and Equal-Channel Angular Pressing. Nanomaterials 2019, 9, 1070.

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