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An Alumunium alloy (AA) 6061 was solution treated at 520 0C for 1.5 h and quenched in iced-water. The sample subsequently processed by accumulative roll bonding (ARB) at 50% reduction in one cycle and aged at temperatures of 100, 150, 200 0C for 60, 300, 6000, 9000, 12000, 30000 and 60000 s. The hardness measurement was found that high hardness attained of ~54 HV for sample after cold rolled and subsequently aged up to 60000 s at 100 0C after ARB process. The SEM observation was also showed that the grain sizes were reduced to ~2 mm and the distribution of second-phase Mg2Si particles had become homogeneous. X-ray diffraction analysis by using high score plus software reveal that the significant increase in hardness and strength is due to the formation of second-phase and high micro-strain to 12.54 x 10-4 for sample after processed ARB and aged at low temperature.