Role of equilibrium and non-equilibrium grain boundary stress fields on dislocation transmission

Bamney, Darshan; Capolungo, Laurent; Spearot, Douglas E.

doi:10.1557/s43578-021-00129-1

Cited by 10 publications

(2 citation statements)

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“…The underlying DDD-FDM method uses a node-based approach, where the nodal positions are updated based on the calculated nodal forces [58,74,76,77,80]. Herein, only the critical attributes of the newly developed transmission kinematics are discussed.…”

Section: Transmission Kinematicsmentioning

confidence: 99%

“…Dislocation dynamics can bridge information between the atomistic and larger length scale continuum models. Both the phase field dislocation dynamics (PFDD) where the discrete dislocations and the interfaces can be modeled explicitly [58][59][60][61][62][63] as well as discrete dislocation dynamics (DDD) methods have been employed [44,[64][65][66][67][68][69][70][71][72]. Akasheh et al [64] investigated the interaction of a single threading dislocation with interfacial dislocations and observed more accurate predictions of strength of the nano-layered structures with respect to corresponding experiments.…”

Section: Introductionmentioning

confidence: 99%

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Role of interfaces on the mechanical response of accumulative roll bondednanometallic laminates investigated via dislocation dynamics simulations

Chakraborty

Kohnert

Hunter

et al. 2023

Preprint

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Unraveling the effects of continuous dislocation interactions with interfaces, particularly at the nanometer length scales, is key to a broader understanding of plasticity, to material design and to material certification. To this end, this work proposes a novel discrete dislocation dynamics-based model for dislocation interface interactions tracking the fate of residual dislocation on interfaces. This new approach is used to predict the impact of dislocation/interface reactions on the overall mechanical behavior of accumulative roll bonded nanometallic laminates. The framework considers the dynamic evolution of the interface concurrent with a large network of dislocations, thus, accounting for the local short and long range effects of the dislocations under the external boundary conditions.Specifically, this study focuses on two-phase Fe/Cu nanometallic laminates, and investigates the role of the underlying elastic and plastic contrast of the Fe and the Cu layers on the composite response of the material. Moreover, the role of initial microstructures, resulting from processing is also investigated. Subsequently, the model is used to examine the effect of layer thickness and interface orientation relationship on the residual stresses of the relaxed microstructure. The associated mechanical response of these laminates are compared when loaded under normal direction compression, as well as shear compression.Finally, this work predicts a dominant effect of the layer thickness, as compared to the interface orientation relationship, on the macroscopic response and on the residual stresses of these nanolaminates, while the local dislocation transmission propensity through the interface is significantly influenced by the corresponding orientation relationship.

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