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Tribology Letters

, 66:156 | Cite as

Graphene Nanoplatelet (GNP)-Incorporated AZ31 Magnesium Nanocomposite: Microstructural, Mechanical and Tribological Properties

  • M. Arab
  • S. P. H. Marashi
Original Paper
  • 38 Downloads

Abstract

Graphene nanoplatelets (GNPs), despite their unique properties, were not widely investigated as reinforcement in metal matrix nanocomposites. The nanocomposite was fabricated by adding 15-nm-thick GNPs to AZ31 magnesium alloy via friction stir processing (FSP). Mechanical, frictional and wear properties were investigated. It was observed that refined microstructure with a range of 3–9 µm grain size and the presence of GNPs, i.e., reinforcing particles, improved the tensile properties and increased the ultimate tensile strength to 278 MPa. FSP increased the strain-to-fail by 133% compared to that of base metal, while it was decreased by adding GNPs. Moreover, the presence of GNPs decreased the adhesive wear mechanism by squeezing out, smudging on the surface and, finally, forming a protective layer between the sliding surfaces. Hence, the coefficient of friction was decreased to 60% and the range of fluctuations in friction plot was confined by adding GNPs. They were further decreased by increasing the normal load and sliding velocity due to easier debonding of the GNPs and the surrounding AZ31 Mg matrix resulting in forming a lubricating layer between sliding surfaces.

Keywords

AZ31 Mg alloy Graphene nanoplatelets (GNPs) Self-lubricating nancomposite Friction stir processing (FSP) Self-lubrication friction Tribological properties 

Notes

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Mining and Metallurgical EngineeringAmirkabir University of TechnologyTehranIran

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