Post-annealing, fractographic and corrosion failure analyses on tri-modal Mn-particulate Al/Cu multilayered composites

In this work, Mn-particulate Al/Cu multilayered (70Al/25Cu/5Mn) composites were fabricated by the accumulative roll bonding (ARB) process. Afterwards, the structure (after ARB and post-annealing) and failure (tensile fracture and corrosion in 3.5 wt% NaCl solution) studies were conducted on the specimens processed for different ARB cycles. Based on the results, no intermetallic compound was formed in the ARB-processed composites even to 9 cycles. Nonetheless, Al-Cu-(Mn) intermetallics were detected in the annealed samples, so that their amount was enhanced by increasing ARB cycle. Concerning the failure analyses, the resistance of the produced composites against corrosion and fracture, contrary to strength, was reduced by increasing ARB cycles.