چكيده به لاتين
Accumulative roll bonding (ARB) is one of the severe plastic deformation (SPD) methods for production of metal laminated. In this study, an accumulative roll bonding process was used for the production of composite materials from aluminum alloy AA6061 and Cu pure metal up to four passes at room temperature. Before the application of accumulative roll bonding, the bond strength of the sheets was evaluated using a peeling test. The purpose of this study was to investigate the performance of accumulative roll bonding process on AA6061 and pure Cu alloys. In addition, to investigate the microstructure and mechanical properties of composites produced. In order to investigate the microstructure of the composites produced from the optical microscope, scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used. The dislocation density was also calculated using the Williamson-Hall and Reitveld methods using X-ray diffraction patterns. Calculations performed for the dislocation density showed that the highest dislocation density was obtained in the third pass and decreases with the continuation of the process due to the dynamic recovery during deformation. In order to evaluate the mechanical properties, a microhardness test and a single axial pull test were used. The results of the microhardness test showed that increasing the number of accumulative roll bonding passes, increases the hardness of the specimens, while due to results the severity of the hardening was more in first pass. According to the results of the tensile test, the yield strength of the first pass enhanced 3.5 times compared to the annealed sample. Also, the study of hardness properties showed that by using ARB process, the workability was significantly reduced compared to the annealed sample. After the tension test, the fracture surface of the samples was examined by SEM. By examining the level of fracture of the elongation samples, defects in ARB samples were observed as ductile or soft. It should be noted that with increasing the number of ARB passes, the accumulative roll bonding of the failure mechanism leads to a quasi-soft failure.
Keywords:
Accumulative roll bonding (ARB), plastic deformation, AA-6061 and Cu composite, SPD
