Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/7591
Title: Development of graphene nanoplatelet-reinforced AZ91 magnesium alloy by solidification processing
Authors: Kandemir, Sinan
Keywords: Graphene nanoplatelets
Magnesium alloys
Metal matrix composites
Microstructure
Mechanical property
Issue Date: Jun-2018
Publisher: Springer Verlag
Source: Kandemir, S. (2018). Development of graphene nanoplatelet-reinforced AZ91 magnesium alloy by solidification processing. Journal of Materials Engineering and Performance, 27(6), 3014-3023. doi:10.1007/s11665-018-3391-x
Abstract: It is a challenging task to effectively incorporate graphene nanoplatelets (GNPs) which have recently emerged as potential reinforcement for strengthening metals into magnesium-based matrices by conventional solidification processes due to their large surface areas and poor wettability. A solidification processing which combines mechanical stirring and ultrasonic dispersion of reinforcements in liquid matrix was employed to develop AZ91 magnesium alloy matrix composites reinforced with 0.25 and 0.5 wt.% GNPs. The microstructural studies conducted with scanning and transmission electron microscopes revealed that fairly uniform distribution and dispersion of GNPs through the matrix were achieved due to effective combination of mechanical and ultrasonic stirring. The GNPs embedded into the magnesium matrix led to significant enhancement in the hardness, tensile strength and ductility of the composites compared to those of unreinforced AZ91 alloy. The strength enhancement was predominantly attributed to the grain refinement by the GNP addition and dislocation generation strengthening due to the coefficient of thermal expansion mismatch between the matrix and reinforcement. The improved ductility was attributed to the refinement of β eutectics by transforming from lamellar to the divorced eutectics due to the GNP additions. In addition, the strengthening efficiency of the composite with 0.25 wt.% GNP was found to be higher than those of the composite with 0.5 wt.% GNP as the agglomeration tendency of GNPs is increased with increasing GNP content. These results were compared with those of the GNP-reinforced magnesium composites reported in the literature, indicating the potential of the process introduced in this study in terms of fabricating light and high-performance metal matrix composites.
URI: https://doi.org/10.1007/s11665-018-3391-x
https://hdl.handle.net/11147/7591
ISSN: 1059-9495
1059-9495
Appears in Collections:Mechanical Engineering / Makina Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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