| Abstract Scope |
Accumulative roll bonding (ARB) was employed to fabricate ultrafine grained AA1050 aluminum using two thickness reductions (50% and 70%) and three passes (3, 4, and 6). The influence of deformation severity on the microstructure, crystallography, and mechanical properties was investigated using optical microscopy, XRD, microhardness, and tensile testing. Increasing the reduction ratio and number of passes promoted grain refinement, increased dislocation density and lattice strain, and enhanced deformation texture, accompanied by XRD peak broadening and intensity variations. Microhardness increased progressively with processing severity due to Hall-Petch and dislocation strengthening mechanisms. Tensile properties also improved significantly; however, the response depended on the reduction ratio. The 50% reduction maintained favorable balance between strength and ductility, whereas the 70% reduction produced the highest strengthening owing to extensive grain refinement, although at the expense of ductility. The results demonstrate that ARB effectively tailors the microstructure and mechanical performance of AA1050 through controlled strain accumulation. |