While the grain size effect (GSE) is universally observed in polycrystalline metals and alloys,
extended dislocation pileups (DPUs) at grain boundaries (GBs) are rarely observed …

Dislocation pile-ups at grain boundaries determine the back-stress opposing plastic
deformation while promoting yielding in neighbouring grains. A regular array of parallel pile …

One explanation of the Hall-Petch relationship is that dislocation pile-ups serve to enhance
the stress felt at grain boundaries. This dislocation pile-up model results in ad− ½ …

A thorough analysis of experimental observations provides clear evidence that plastic
deformation in polycrystals starts at grain boundaries at applied shear stresses ranging from …

Plastic deformation characteristics of ultra-fine grained (UFG) and nano-cystalline (NC)
materials have been paid much attention. Cheng et al. classified the deformation …

Yielding in metals originates by activation of dislocation movement on certain slip systems.
In austenitic stainless steels, the relatively low stacking fault energy means that planar slip …

A single crystal plasticity theory for insertion into finite element simulation is formulated using
sequential laminates to model subgrain dislocation structures. It is known that local models …

An analytic model of the evolution of dislocation density in fcc polycrystals is described. The
evolution equations approximately account for most known dislocation storage, dynamic …

The dependence of shear yield strength on grain size is analyzed using discrete dislocation
dynamics. Plastic deformation is modeled through the motion of edge dislocations in an …

The grain size dependence of the flow strength of polycrystals is analyzed using plane
strain, discrete dislocation plasticity. Dislocations are modeled as line singularities in a …