On the Post-aging of the ARB Created AA۱۰۵۰\AA۲۰۲۴(pre-aged)\Al۲O۳ Composites

In this study, multilayered aluminum-based composites consisting of AA۱۰۵۰ (۶۶.۶ vol.%) and pre-aged AA۲۰۲۴ (۳۳.۴ vol.%) with a trace addition of Al₂O₃ nanoparticles (۰.۰۰۵ vol.%) were successfully fabricated using six cycles of accumulative roll bonding (ARB). The composites were subsequently subjected to post-aging at ۱۱۰, ۱۵۰, and ۱۹۰ °C for varying durations (۰–۱۰ h) to optimize their microstructural and mechanical performance. A combination of optical microscopy, SEM, TEM, microhardness, and tensile testing was employed to evaluate the materials. The results revealed that ARB, in combination with minimal nanoparticle reinforcement, led to significant grain refinement. Remarkable enhancements in tensile strength (up to ۲۲۰ MPa, a ۲۱۵% increase over annealed AA۱۰۵۰) and ductility (۱۴% total elongation) were achieved by ARB and post-aging. Notably, the presence of alumina nanoparticles not only delayed over-aging but also contributed to improve particle–matrix bonding and structural stability. This work introduces a practical approach for tailoring high-performance aluminum composites via hybrid strategies involving ARB, precipitation hardening, and nanoparticle-assisted microstructure refinement.

کلیدواژه ها:

Aluminum ، Accumulative Roll Bonding ، Aging Process ، Nanocomposites ، Alumina