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Interaction between deformation twinning and dislocation slip in polycrystalline solids

Ocegueda, Eric and Bhattacharya, Kaushik (2022) Interaction between deformation twinning and dislocation slip in polycrystalline solids. . (Unpublished)

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Deformation twinning is a form of permanent deformation that is commonly observed in low symmetry crystals such as hexagonal close-packed (hcp) metals. With recent increased interest in using hcp metals, such as magnesium, in structural, automotive, and armor applications due to their high strength to weight ratio, there is a need for a comprehensive understanding of deformation twinning and its interaction with dislocation slip. A great deal has been learned at the microscopic level where individual dislocations interact with twin boundaries through atomistic simulations, and at the macroscopic level by ignoring morphology and treating twinning as `pseudo-slip'. However, twins form collectively across multiple grains with complex morphology that affects the bulk behavior. These mesoscale aspects have been less studied and are the focus of this paper. We present a model that describes the twin and slip morphology, its evolution, and interactions in a unified manner at the scale of several grains and use it to study the implications on macroscopic behavior. The key ideas are to combine a phase-field model of twinning with a crystal plasticity model of slip, and to implement it in parallel on graphic processing units for fast computations.

Item Type:Report or Paper (Discussion Paper)
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URLURL TypeDescription Paper
Ocegueda, Eric0000-0001-7845-6890
Bhattacharya, Kaushik0000-0003-2908-5469
Additional Information:Attribution 4.0 International (CC BY 4.0) We gratefully acknowledge the support of the US Army Research Laboratory through Cooperative Agreement Number W911NF-12-2-0022 and the US National Science Foundation through “Collaborative Research: Optimal Design of Responsive Materials and Structures” (DMS-2009289). The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein. The computations presented here were conducted on the Resnick High Performance Cluster at the California Institute of Technology.
Group:Resnick Sustainability Institute
Funding AgencyGrant Number
Army Research LaboratoryW911NF-12-2-0022
Record Number:CaltechAUTHORS:20220304-171248075
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113725
Deposited By: George Porter
Deposited On:07 Mar 2022 20:45
Last Modified:07 Mar 2022 20:45

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