Wide stacking fault of aluminum for multilayered TiB₂/Al-Ni composite by roll bonding process

In this paper, a multilayered TiB₂/Al-Ni composite was successfully processed via roll bonding process using TiB₂ particles reinforced aluminum matrix composite (TiB₂/Al) foils and Ni foils as starting materials. There existed a supersaturated solid solute layer (denoted by Al (Ni) layer) near the interface between TiB₂/Al-Ni layers. Wide stacking faults, up to 20nm in width, were observed in the Al (Ni) layer. High-resolution electron microscope was used to identify the wide stacking fault. The broadening of stacking fault is attributed to addition of Ni and the local high stress during the rolling process. The presence of stacking fault increases the hardness of interface, and accommodated stress concentration during rolling between TiB₂/Al-Ni layers to increase deformability of the TiB₂/Al-Ni composite.