In this study, Al/Al2O3/B4C nano-composites were fabricated via the accumulative roll bonding (ARB)
process. The grain refinement of the Al/Al2O3/B4C nano-composite strips during the ARB process was
studied. Microstructural characterizations of the fabricated composites after 2, 5, and 9 cycles were
performed by transmission electron microscopy (TEM). The results showed that the composite sample,
after 9 cycles, was filled with homogenously distributed ultra fine grains with an average grain size of
230 nm. The findings also revealed that the increase in the dislocation density due to the presence of
the nano-sized particles resulted in the grain refinement of the specimens. It was also found that the
grain refinement is accelerated by the presence of the refinement particles.
کلید واژگان :
A. Metal–matrix composites (MMCs) B. Microstructure D. Electron microscopy
