The relationship between strain rate sensitivity and activation volume for face-centered-cubic metals was proposed based upon the bow-out model of single dislocation from its source, which gave reasonable prediction of the enhanced strain rate sensitivity that occurred in nanostructured and ultra-fine grained Ni and Cu.

Strain Rate Sensitivity of Face-Centered-Cubic Nanocrystalline Materials Based upon Dislocation Deformation. J.Lian, C.Gu, Q.Jiang, Z.Jiang: Journal of Applied Physics, 2006, 99[7], 076103 (3pp)