Mechanistic models for the activation volume and rate sensitivity in metals with nanocrystalline grains and nano-scale twins

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Nanotwinned and hierarchical nanotwinned metals: a review of experimental, computational and theoretical efforts (2018, background): “The critical resolved shear stress for triggering the nucleation of partial dislocations is described by previous works.(103,201,202) The maximum strength occurs when both twinning and the inclined dislocation slip are active.”
Extra strengthening and work hardening in gradient nanotwinned metals (2018, background): “S8A) emit from the interface (28) toward nearby TBs.”
Review on superior strength and enhanced ductility of metallic nanomaterials (2018, background): “formed due to GB sliding, such as dislocations [248,257], disclination dipoles [174,176] (Fig.”
Mechanically-induced grain coarsening in gradient nano-grained copper (2017, result): “These calculated V* is consistent with the experimental measured data of NG Cu, which is roughly 10 20b3 [32,47].”