Effect of TiO2 nanoparticles on the bond strength of CP Ti sheet by cold rolling method

In this work, the strength of the cold roll bond of the commercially pure titanium (CP Ti) sheet and the effect of TiO2 nanoparticles on the bond strength were investigated. Through the accumulative roll bonding process, which is considered one of the important severe plastic deformation processes, the creation of suitable bonds can play a significance role in the ultimate strength of the bond. Thus, at first the optimum bonding parameters of two or several metals producible via ARB method were studied and then manufactured. In the present work, the bond strength of the commercially pure titanium sheets was investigated. Based on the results of the peeling test for CP Ti it was found that by applying a 50% thickness reduction, a desirable bond strength was achieved. To study the effect TiO2 nanoparticles on nanocomposite preparation in the ARB test, these nanoparticles were dispersed between the CP Ti sheets at 0.1, 0.3 and 0.5wt% concentrations. The results showed a decrease in the bond strength during the peeling test by the increase in the TiO2 content. The scanning electron microscopy (SEM) tests of the peeled sites revealed that the presence of cumulative layers of nanoparticles prevented bonding in these areas. Although the addition of TiO2 nanoparticles resulted in the reduced bond strength, at TiO2 percentages equal or less than 0.5wt.%, this decrease was negligible. Hence, the ARB method could be considered as an efficient technique for the preparation of the bulk composite at room temperature.