In this study, Anodizing and accumulative roll bonding (ARB) processes were used for manufacturing aluminum/alumina/titanium composites including various Al 2 O 3 quantities. Before fabricating Al/Al 2 O 3 /Ti composite, the peeling test was utilized to evaluate the effective parameters on bond strength of aluminum/titanium layers. Results obtained indicated that increasing the thickness of alumina layer reduce the bond strength of Al/Ti layers and by increasing the reduction, the bond strength would increase. The microstructural evolution and mechanical properties, incuding tensile strength and microhardness, of Al/0.22 vol.% Al 2 O 3 /Ti composite during various ARB cycles were reported. After four cycles of ARB process, cracks at Al/reinforcement interfaces were appeared. In adition, reinforcement particles were not distributed in the matrix properly. Tensile strength was reduced after 4 cycles, but microhardness increased up to 4 cycles of ARB process. By increasing the amount of alumina layers on the aluminum, tensile strength and microhardness increased. To investigate the failure mode, fracture surfaces of tensile speciems were studied by scanning electron microscopy (SEM). It was found that Al/0.22 vol.% Al 2 O 3 /Ti, Al/0.43 vol.% Al 2 O 3 /Ti and Al/0.65vol.%Al 2 O 3 /Ti composites exhibite a britlle fracture, having elongated dimples. Based on the results obtained, continual annealing and roll-bonding (CAR) process was used to fabricate aluminum/alumina/titanium composites. After six cycles of CAR process, the Al/0.22 vol.% Al 2 O 3 /Ti composite showed a proper distribution of alumina and titanium particles in the matrix. It was seen that by increasing the number of cycles, the microhardness of samples is increased. It was found that the tensile strength of Al/0.22 vol.% Al 2 O 3 /Ti composite is decreased after the first cycle and then increase up to 192 MPa at the sixth cycle. By increasing the quantity of alumina, microhardness and tensile strength were increased. It was found that Al/0.22 vol.% Al 2 O 3 /Ti and Al/0.43 vol.% Al 2 O 3 /Ti composites exhibite a ductile fracture, having dimples and shear zones. Key Words : Accumulative roll bonding (ARB) proce continual annealing and roll-bonding (CAR) proce composite, mechanical properties
