Characterization of Microstructure and Mechanical Properties of Multilayer Al/Cu/Mg/Ni Composite Produced through Accumulative Roll Bonding

Abstract

In this research, Al/Cu/Mg/Ni multilayer composite was produced by accumulative roll bonding process. Microstructure evolution and mechanical properties of the composites are evaluated within different cycles of accumulative roll bonding process. Optical microscope images showed that after six accumulative roll bonding cycles, a multilayer Al/Cu/Mg/Ni composite with homogenously distributed fragmented Cu, Mg, and Ni layer particles in Al matrix was achieved. With increasing the accumulative strain, the strength and elongation of the composites increased. Also, the measurement of specific strength which is defined as strength-to-density ratio showed that specific strength of the composite has become about 3.25 times higher than that of matrix metal (Al). Fracture mode has changed from normal in the primary sandwich to normal-and-shear in 6th accumulative roll bonding cycle, and due to the observed dimples in both conditions, it can be concluded that fracture mode in the composites was ductile.