Abstract
This paper addresses the factors affecting the mechanical properties of the AlMg6/Carbon Nanotube (CNT) produced using the accumulative roll bonding (ARB) process. It is demonstrated that using an optimum amount and good dispersion of CNTs is critical for achieving high-strength CNT reinforced Al. The results indicated that the addition of 2 vol % of CNTs, ball-milled with aluminum powder to suppress CNT agglomeration, improved the tensile strength of four-pass ARB processed AlMg6 by 20% without sacrificing the ductility. This can be related to the good dispersion of CNTs and the effect of the CNT on the accelerated dislocation generation during ARB, which facilities grain refining during severe plastic deformation. The evolution dislocation density, grain size, and flow stress of the composite during the ARB process were predicted by the ETMB (Estrin, Toth, Molinari, and Brechet) model. A good agreement was found between the predicted and experimental results.
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