Microstructure and mechanical properties of ARB-processed AA1050/AA5052 multilayer laminate sheets during cryorolling

AA1050/AA5052 multilayer laminate sheets were fabricated by accumulative roll bonding (ARB) and cryorolling (CR). The ultimate tensile strength (UTS) of the laminate sheets produced by combining ARB and CR increased up to 18.4% compared to that by five ARB passes. Necking and fracture occurred in the hard layer after the fourth ARB pass. In contrast, the hard layer remained continuous and relatively straight during CR, which suggested that CR can delay the onset of necking and fracture. TEM results showed that CR can not only refine grain size but also significantly improve interfacial bonding quality. CR can accumulate higher dislocation density. Therefore, the laminate sheets prepared by the combination of ARB and CR obtained better mechanical properties than that by five ARB passes.

Automated summary

Laminate sheets made from AA1050/AA5052 using accumulative roll bonding (ARB) and cryorolling (CR) showed an 18.4% increase in ultimate tensile strength compared to those made by five ARB passes. Cryorolling not only refined grain size and improved interfacial bonding quality, but also delayed necking and fracture in the hard layer. The combination of ARB and CR resulted in better mechanical properties due to the accumulation of higher dislocation density.