عنوان مقاله [English]
Accumulative roll-bonding process that is one of the severe plastic deformation processes is investigated by the authors in order to fabricate ultrafine grained aluminum/brass composite. In this study, the aluminum composite is reinforced with brass in seven cycles of accumulative roll-bonding at room temperature and without any heat treatment. Tensile strength and hardness of the composite increase strongly in the first cycle. These mechanical properties do not change significantly with increasing the number of cycles. After seven cycles of the process, tensile strength and hardness of the composite compared to the initial Al sheet respectively increased to 46% and 85%. Also, elongation of the composite decreases strongly in the first two cycles and slightly increased in the following cycles. These changes in the mechanical properties during the accumulative roll-bonding process are due to the strain hardening and cold working mechanism in the primary cycles and the grain refinement in the final cycles. The microstructure results of the composite shows that the average values of grains reach 250 nm and the distribution of brass particles in the composite become more uniform with increasing the accumulative roll-bonding cycles.