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

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 proper...

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Bibliographic Details
Published in:Tribology letters 2018-12, Vol.66 (4), p.1-11, Article 156
Main Authors: Arab, M., Marashi, S. P. H.
Format: Article
Language:English
Subjects:
Adhesive wear
Base metal
Chemistry and Materials Science
Coefficient of friction
Corrosion and Coatings
Friction
Friction stir processing
Grain size
Graphene
Linearization
Lubrication
Magnesium base alloys
Materials Science
Metal matrix composites
Microstructure
Nanocomposites
Nanotechnology
Original Paper
Physical Chemistry
Sliding
Surfaces and Interfaces
Tensile properties
Theoretical and Applied Mechanics
Thin Films
Tribology
Ultimate tensile strength
Variations
Wear mechanisms
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Summary: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.
ISSN:1023-8883
1573-2711
DOI:10.1007/s11249-018-1108-9