Publication Details

Fadavi Boostani, A., Tahamtan, S., Jiang, Z. Y., Wei, D., Yazdani, S., Azari Khosroshahi, R., Mousavian, R. Taherzadeh ., Xu, J., Zhang, X. M. & Gong, D. (2015). Enhanced tensile properties of aluminium matrix composites reinforced with graphene encapsulated SiC nanoparticles. Composites Part A: Applied Science and Manufacturing, 68 155-163.

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Due to a high propensity of nano-particles to agglomerate, making aluminium matrix composites with a uniform dispersion of the nano-particles using liquid routes is an exceptionally difficult task. In this study, an innovative approach was utilised to prevent agglomeration of nano-particle by encapsulating SiC nano-particles using graphene sheets during ball milling. Subsequently, the milled mixture was incorporated into A356 molten alloy using non-contact ultrasonic vibration method. Two different shapes for graphene sheets were characterised using HRTEM, including onion-like shells encapsulating SiC particles and disk-shaped graphene nanosheets. This resulted in 45% and 84% improvement in yield strength and tensile ductility, respectively. The former was ascribed to the Orowan strengthening mechanism, while the latter is due primarily to the fiber pull-out mechanism, brought about by the alteration of the solidification mechanism from particle pushing to particle engulfment during solidification as a consequence of high thermal conductive graphene sheets encapsulating SiC particles.

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