Development and characterization of Al/MWCNT–Al₂O₃ hybrid composite by accumulative roll bonding

A high-strength hybrid composite was produced by eco-friendly accumulative roll bonding (ARB) process. Multiwall carbon nanotubes and alumina layers as reinforcements were embedded in a matrix of aluminum 1100. The produced hybrid composite was evaluated for structural changes and mechanical properties. The structural micrographs showed that by increasing the rolling cycles, a more uniform distribution of the reinforcements is obtained. After ten cycles of ARB, the composite material reached strength of about 300% higher than that of the annealed aluminum 1100. The elongation of the composite material is decreased by adding reinforcements. However, at a constant value of reinforcements, the elongation slowly increased during sequential rollings. A shear ductile rupture type failure was responsible for fracture of tensile test specimens of both composite and monolithic specimens.