Grain Size Saturation during Severe Plastic Deformation
Ultra-low carbon steel (ferritic steel), commercial purity aluminum and high purity copper were heavily deformed by the accumulative roll bonding (ARB) process, and the microstructural evolution during the ARB was analyzed. Significant grain refinement by grain subdivision mechanism was confirmed in all three kinds of materials. On the other hand, microstructure refinement slowed down with increasing strain and the grain size stayed in nearly a constant value in the ultrahigh strain region. The mechanism of the grain size saturation was discussed.
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
N. Tsuji et al., "Grain Size Saturation during Severe Plastic Deformation", Materials Science Forum, Vols. 539-543, pp. 2837-2842, 2007