Severe plastic deformation (SPD) techniques allow the production of materials with ultrafine to nanocrystalline microstructures which exhibit remarkable mechanical properties. The accumulative roll bonding (ARB) process has been applied to produce CuSn4/Fe laminated nanocomposites with layer thickness in the range of submicron to nanometer.
The CuSn4/Fe laminated nanocomposites were successively roll bonded with 50% thickness reduction. Heat treatment at 400 ◦C was applied following each pass. The rolling cycle was repeated at least 10 times in order to achieve a layer thickness in the submicron range and a well-defined laminated structure with uniform layer thickness is observed. Microstructure and texture of the nanocomposites were evaluated using backscatter electron (BSE) imaging and electron backscatter diffraction (EBSD), respectively. A refined and elongated microstructure in the rolling direction in the Fe layer and large grains of CuSn4 due to recrystallization are detected. Mechanical properties were investigated through tensile and nanoindentation tests in order to observe the changes both locally and globally as the number of ARB passes increased, where an increase in the strength of the nanocomposite with the number of ARB passes is noted. Furthermore, the layer interfaces of the nanocomposite at different rolling cycles were analyzed using Atom Probe Tomography (APT).