Accumulative roll bonding (ARB) is a severe plastic deformation process to produce high strength metallic sheets with ultra-fine grains. On the other hand, ageing heat treatment is one of the methods for improving mechanical properties of metals. In this study, ARB process was carried out on 6061 aluminum alloy sheets up to 5 cycles at room temperature without lubrication. Then, ageing heat treatment was carried out in two cycles (160°C for 5 hours and 100°C for 48 hours). The quality of roll bonding produced in ARB was investigated using (SEM) and peeling test. Microstructures during ARB and ageing treatment were characterized by transmission electron microscopy (TEM). By using Rietveld method, microstructural parameters such as microstrain and dislocation density were quantitively analyzed. Tensile tests and Vickers microhardness were measured on produced sheets. SEM fractography was also performed in order to clarify the failure mechanism. Moreover, the texture parameter of the ARBed samples was calculated using their XRD patterns and the related equation. Additionally, the texture evolution during ARB process was demonstrated by analyzing the measured pole figures, orientation distribution functions (ODF) and skeleton lines. The SEM observations and peeling test results revealed that the bonding strength of the ARBed sheets was acceptable except those bonds formed in the last cycles. After five cycles, it was found that continuous recrystallization has occurred and the microstructure was covered with the ultrafine equiaxed grains of an average diameter about 230 nm. Three phenomena including grain subdivision, formation of lamellar boundaries (LBs) parallel to the rolling direction and continuous recrystallization (in-situ recrystallization) were identified to be responsible for the grain refinement. The tensile strength and hardness of the 5 cycles ARB processed 6061 aluminum alloy sheet increased about 2.5 times of the initial values, whereas the elongation dropped abruptly at the first cycle and then slightly decreased to around 5% at the 5th cycle. Fracture surface observations showed that failure mode in ARB processed aluminum is internal shearing between voids. After ageing heat treatment in both states (160 °C for 5 hour and 100°C for 48 hour) on ARBed specimens, strength and elongation increased, simultaneously. Microstructural studies and Rietveld method results showed that formation of small precipitates and recovery occurrence were responsible for simultaneous increase in elongation and strength after ageing. Texture evaluations demonstrated that, after five cycles, three components were predominate including dillamore, copper and brass.