محمدعلی مهتدی بناب

In this study, the evolution of deformation texture in steel-based nanocomposite fabricated via accumulative roll bonding (ARB) process was investigated. Textural evolution during the ARB process was evaluated using x-ray diffraction. It was found that with increasing number of ARB cycles, first, intensity of a-fiber, c-fiber, and h-fiber decreased and then increased, while f-fiber exhibited the opposite trend compared to these fibers. Also, there were texture transitions in e-fiber and g-fiber. It was realized that with increasing the number of ARB cycles, volume fraction of low-angle grain boundary decreased and the fraction of highangle grain boundary increased. In addition, shear texture was predominant after first cycle, while for other samples, rolling texture was dominant. When recrystallization occurred, the intensity of f-fiber increased, the intensity of a-fiber and c-fiber decreased, and the intensity of {011}Æ100æ orientation in e-fiber and g-fiber remarkably increased. Indeed, the transition from rolling texture to shear texture was a sign of occurrence of discontinuous recrystallization after the first ARB cycle. Moreover, in the one-cycle sample, nucleation of discontinuous recrystallization had occurred. Finally, with increasing the number of cycles, the intensity of rolling texture increased and the intensity of shear texture decreased.