Effect of Mechanically Alloyed Graphene-Reinforced Aluminium by Equal Channel Angular Pressing (ECAP)

Abstract

ECAP has proved to be an effective method to obtain ultrafine grain structure. Methods like extrusion are used in industries to obtain Al-based alloys, and composites as high loads for pressing are recommended for powder consolidation without very high temperatures. In the present study, the alloyed powder was prepared by mechanical ball milling for homogeneous mixing, and ECAP was performed at Route A with 120° channel angle. Back pressure improves the homogeneity of the grain structure and reduces the crystallite size. SEM analysis reveals good bonding between the graphene and aluminium particles. Uniform dispersion of graphene particles present in the aluminium alloy is observed, and it indicates the formation of a homogenous grain structure. It is also observed to have decidedly fewer void spots that refer to pores present and the ECAP process improves grain refinement.