Investigation Of Mechanical Properties Of Commercial Pure Aluminum 1060 And Aluminum Alloy 6061 After Accumulative Roll Bonding

Accumulative roll bonding (ARB) is an important method to process ultra fine-grained materials. Compared with the traditional severe plastic deformation processing, higher accumulative strain can be obtained by the ARB method. In this study, accumulative roll bonding treatment of aluminum 1060, aluminum alloy 6061 and 1060/6061 were performed. ARB processing of the 1060 aluminum was performed at room temperature and 200℃. Microstructure characterization, tension test, micro-hardness and scanning electron microscope were utilized. Mechanical properties of the ARBed material were analyzed. The effect of rolling temperature on mechanical properties of the ARBed 1060 was investigated. Additionally, mechanical properties of the ARBed 6061 aluminum alloy and the 1060/6061 sample were also investigated. The main results were obtained as follows:(1) For the ARB processing at room temperature, the strength of industrial pure aluminum 1060 increases with increasing rolling cycle. Plasticity of the sample after 1 ARB cycle decreases substantially. Plasticity remains stable with the increase in rolling cycle. When the ARB was performed at 200℃, substantial increase in strength can be observed after ARB for one cycle, where as its plasticity decreases significantly. The difference in elongation is not obvious.(2) Strength of the ARB processed 1060 material rolled at 200℃ is generally lower than that of the ARB processed 1060 at room temperature. However, plasticity of the material rolled at 200℃ are better than the material rolled at room temperature at the same ARB cycle. The result indicates that better static toughness can be obtained in the material rolled at 200℃.(3) For the ARB processed 6061 aluminum alloy, strength increases with the increase in ARB cycle, whereas plasticity decreases gradually. Micro-hardness also increases with ARB cycle. Deformation and fracture mode changes from necking to shear deformation with the increase in rolling cycle.(4) For the ARB processed 1060/6061 material, strength and micro-hardness increases with ARB cycle, whereas their plasticity decreases. Static toughness of the three-layered 1060/6061 material is higher than that of the two-layered 6061 material at the same rolling cycle.