Microstructure and mechanical properties of aluminium-graphene composite powders produced by mechanical milling

Abstract

Background: Graphene has been reported to be a promising nanofiller in fabricating advanced metal matrix composites. Methods: Graphene nanosheets (GNSs) have been incorporated into an aluminium matrix composite using mechanical milling and hot pressing in the current study. Results: The SEM observation shows that aluminium particles are firstly flattened into flakes, and then fractured/ rewelded into equiaxed particles as the ball milling progresses. The crystalline size is decreased and the lattice strain is increased during the ball milling, which are also intensified by the added GNSs. The hardness of the composite is increased by 115.1% with the incorporation of 1.0 vol. % GNSs. Conclusions: The local stress induced by the hard GNSs accelerates the milling process. The X-Ray diffraction patterns show that the intensity ratio of (111) to (200) can reflect the preferred orientation of the particle mixture, and the evolution of I(111)/I(200) agrees well with the observed results using SEM. The increased hardness is mainly attributed to the refined microstructure and Orowan strengthening.

Effect of graphite nanoplatelets on spark plasma sintered and conventionally sintered aluminum-based nanocomposites developed by powder metallurgy

“…10 (a) also show the presence of a detectable amount of the carbides in the SPSed nanocomposites. An increment in the reinforcement addition and higher sintering temperature strongly favours the formation of Al4C3 [55,56]. O for the Al4C3 particles.…”

Different Synthesis Routes of Graphene-Based Metal Nanocomposites

“…Composites of GPL and powdered Al were prepared by Bartolucci et al 99 106 using ball milling technique which depicted high reversible capacity, enhanced cycling stability, and good rate capability to be used as high-performance anode materials for LIBs. Zhang et al 107 prepared GNS-Al nanocomposite using ball milling which revealed increase in hardness by 115.1% due to the refined microstructure and Orowan strengthening.…”

New Graphene Composites for Power Engineering

“…(d) Deposition of monoatomic carbon coats (graphene) using the CVD method on the surface of Al or Cu wires and their further plastic processing to form wires with required characteristics. (e) Mechanical synthesis of Al powders coated with graphene or Cu powders coated with graphene to a form facilitating their further plastic processing to make wires with required characteristics [23][24][25][26][27][28][29][30].…”