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Crystals 2017, 7(6), 152; doi:10.3390/cryst7060152

Modeling and Characterization of Grain Boundaries and Slip Transmission in Dislocation Density-Based Crystal Plasticity

School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99163, USA
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Academic Editor: Sinisa Dj. Mesarovic
Received: 4 May 2017 / Revised: 19 May 2017 / Accepted: 22 May 2017 / Published: 24 May 2017
(This article belongs to the Special Issue Plasticity of Crystals and Interfaces)
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Abstract

In this study, a dislocation density-based model is introduced to analyze slip transmission across grain boundaries in polycrystalline materials. The method applies a combination of the misorientation of neighboring grains and resolved shear stress on relative slip planes. This model is implemented into a continuum dislocation dynamics framework and extended to consider the physical interaction between mobile dislocations and grain boundaries. The model takes full account of the geometry of the grain boundary, the normal and direction of incoming and outgoing slip systems, and the extended stress field of the boundary and dislocation pileups at the boundary. The model predicts that slip transmission is easier across grain boundaries when the misorientation angle between the grains is small. The modeling results are verified with experimental nanoindentation results for polycrystalline copper samples. View Full-Text
Keywords: grain boundary dislocation interaction; visco plastic self-consistent method; continuum dislocation dynamics; Hall-Petch model; Nye’s tensor; nanoindentation grain boundary dislocation interaction; visco plastic self-consistent method; continuum dislocation dynamics; Hall-Petch model; Nye’s tensor; nanoindentation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hamid, M.; Lyu, H.; Schuessler, B.J.; Wo, P.C.; Zbib, H.M. Modeling and Characterization of Grain Boundaries and Slip Transmission in Dislocation Density-Based Crystal Plasticity. Crystals 2017, 7, 152.

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