Simultaneous Enhancement of Tensile Strength and Ductility in Commercial-Purity Aluminum (A1050) by Accumulative Roll Bonding (ARB)

This study presents that A1050 commercial-purity aluminum increases the tensile strength and ductility using the process of accumulative roll bonding (ARB). Although the ductility is rather low after lower numbers of ARB cycles, it increases with increasing numbers of the cycles particularly when the strain rate is lower. The stress-strain behavior is evaluated through microstructure observations and measurements of strain hardening rates. Significant grain refinement with well-defined grain boundaries is responsible for the strength increase. The grain refinement also leads to an increase in strain hardening rate and thus an increase in the ductility.