Bazarnik, P.

Hayden, B.

Huang, Yi

Langdon, T.G.

Lewandowska, M.

Luo, D.

Pereira, P.H.R.

Wan, D.

Yao, J.

Bournemouth University Research Online

The novel method to make graphene-reinforced nanocomposites using HPT technique Yi Huang1,2*, Piotr Bazarnik3, Diqing Wan4, Dan Luo5, Pedro Henrique R. Pereira6, Malgorzata Lewandowska3, Jin Yao7, Brian E. Hayden7, Terence G. Langdon2  1Department of Design and Engineering, Faculty of Science and Technology,  Bournemouth University, Poole, Dorset BH12 5BB, UK.  2Materials Research Group, Department of Mechanical Engineering, University of Southampton, Southampton SO17 1BJ, UK 3Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, 02-507 Warsaw, Poland 4School of Mechanical and Electronical Engineering, East China Jiaotong University, Nanchang, Jiangxi Province 330013, P.R. China 5LiME BCAST, Brunel University London, Uxbridge, Middlesex UB8 3PH, UK 6Department of Metallurgical and Materials Engineering, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil 7Advanced Composite Materials Facility, Department of Chemistry, University of Southampton, Southampton SO17 1BJ, UK  *Corresponding author: Yi Huang (yhuang2@bournemouth.ac.uk)    ABSTRACT   The conventional metal matrix composites are either manufactured by liquid method (e.g. casting) or powder metallurgy method (e.g. sintering). The liquid processing methods usually produces agglomerated particles in the ductile metal matrix due to the large density difference between graphene and the metal matrix which leads to an unwanted brittle nature. The powder metallurgy method would cause oxidation of the metal matrix and produce unclean interfaces between the particulates and the matrix leading to a weak bonding and consequent low mechanical strength. In addition, both liquid and powder methods will not generate a matrix with ultrafine-grained structure due to casting structure  from liquid method and unexpected grain growth in the matrix during high temperature sintering.   High-pressure torsion (HPT), as a new severe plastic deformation technique, can introduce severe shear strain to refine the grain structure in metallic materials and make the reinforcements redistribute within the metal matrix through the flow of turbulent eddy currents. The most important thing is HPT can easily process materials at room temperature without introducing cracks, and can avoid all disadvantages from high temperature processing. Through HPT processing we can attain the real meaning of graphene-reinforced nanocomposites with graphene acting as nano-additives and the metal matrix having nanocrystalline grain structure.  We have successfully developed a room temperature route combined with HPT to manufacture graphene-reinforced aluminium-based nanocomposites with improved dispersion of graphene in aluminium matrix and ultrafine-grained structure in aluminium matrix. The synthesized graphene-Al nanocomposites have improved mechanical strength compared to commercial purity Al.  

The novel method to make graphene-reinforced nanocomposites using HPT technique

http://eprints.bournemouth.ac.uk/36419/1/YH_Thermec2020_Abstract.pdf

The novel method to make graphene-reinforced nanocomposites using HPT technique

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