ABSTRACT: In the present study the accumulative roll-bonding (ARB) process was applied to the 6061 alloy sheets and to clarify the evolution of the microstructures of produced sheets. The accumulative roll-bonding (ARB) process is intense plastic straining process. In the ARB process, a strip is neatly placed on top of another strip. The two layers of material are joined together by rolling (reduction degree of 50%) like a roll-bonding process. Then, the length of rolled material is cut into two halves. These two halves are again stacked and roll-bonded. The whole process is repeated again and again. By the ARB process, Avery fine grain structure of 6061 Al alloy, less than three micron, was formed and the material was strengthened dramatically.