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DC Field | Value | Language |
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dc.contributor.author | Akhil Raj V.R. | |
dc.contributor.author | Hadagalli K. | |
dc.contributor.author | Jana P. | |
dc.contributor.author | Mandal S. | |
dc.date.accessioned | 2021-05-05T10:30:13Z | - |
dc.date.available | 2021-05-05T10:30:13Z | - |
dc.date.issued | 2021 | |
dc.identifier.citation | Journal of Materials Engineering and Performance Vol. 30 , 2 , p. 1234 - 1244 | en_US |
dc.identifier.uri | https://doi.org/10.1007/s11665-020-05433-1 | |
dc.identifier.uri | http://idr.nitk.ac.in/jspui/handle/123456789/16331 | - |
dc.description.abstract | In this work, high fracture toughness graphene–alumina composite was developed through a novel chemical method using boehmite and graphene, which is followed by extrusion and consolidation. The mixed precursors were consolidated by sintering at 1550 °C in a nitrogen atmosphere. The plate-like structures of boehmite form α-alumina; meanwhile, graphene particles at the grain boundaries hinder the growth of alumina grains. The graphene reinforcement was bonded to α-alumina matrix by van der Waals forces. The XRD pattern reveals the presence of graphene with a plane (002) along with α-alumina. Properties such as fracture toughness (5.6 ± 0.01 MPa m0.5), Vickers hardness (1872 ± 25 kgf/mm2) and true density (3.8 g/cm3) were achieved in 0.5 wt.% graphene–alumina composite when compared to α-alumina with fracture toughness (5.3 ± 0.1 MPa m0.5), Vickers hardness (1984 ± 28 kgf/mm2) and true density (3.91 g/cm3). The bridging and deviation of cracks in 0.5 wt.% graphene–alumina composite are attributed to the anchoring and dissipation of energy during crack growth, which enhances the fracture toughness, whereas α-alumina exhibits failure caused by linear crack propagation. Meanwhile, the slight decrease in Vickers hardness and true density of 0.5 wt.% graphene–alumina composite is due to the tribological and low-density properties of graphene. The obtained properties of composite could be suitable in high-temperature, wear-resistant applications such as crucibles, bearings, etc. © 2021, ASM International. | en_US |
dc.title | Improved Fracture Toughness and Crack Arrest Ability of Graphene–Alumina Nanocomposite | en_US |
dc.type | Article | en_US |
Appears in Collections: | 1. Journal Articles |
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