ARB (Accumulative Roll-Bonding) and other new Techniques to Produce Bulk Ultrafine Grained Materials

Accumulative roll‐Bonding (ARB) is a severe plastic deformation (SPD) process invented by the authors in order to fabricate ultrafine grained metallic materials. ARB is the only SPD process applicable to continuous production of bulky materials. In the process, 50 % rolled material is cut into two, stacked to be the initial dimension and then rolled again. In order to obtain one‐body solid material, the rolling in ARB is not only a deformation process but also a bonding process (roll‐bonding). By repeating this procedure, SPD of bulky materials can be realized. In this review paper, various kinds of new SPD mechanical properties of the ARB processed materials are indicated. A comparison of accumulative roll bonding (ARB) and other severe plastic deformation processes for the formation of ultrafine‐grain (UFG) structures is the focus of this contribution; special stress is put on the role of shear deformation. The ARB process, the only SPD technology that uses rolling deformation itself, is suitable for producing the bulk UFG material continuously, and allows a closer insight into the formation mechanism and properties of such materials.