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Phase-Field Modeling of Deformation Twinning and Dislocation Slip Interaction in Polycrystalline Solids

Ocegueda, Eric and Bhattacharya, Kaushik (2022) Phase-Field Modeling of Deformation Twinning and Dislocation Slip Interaction in Polycrystalline Solids. In: Magnesium Technology 2022. Springer International Publishing , Cham, pp. 305-313. ISBN 9783030925321.

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Mechanical twinning is a form of inelastic deformation in magnesium and other hexagonal close-packed (hcp) metals, which has a significant effect on material behavior. Magnesium’s high strength-to-weight ratio has led to its interest in structural, automotive, and armor applications, requiring a comprehensive understanding of twinning’s effect on material response. Past studies have taken either a microscopic approach, through atomistic simulations, or a macroscopic approach, through simplified pseudo-slip models. However, twins interact across the mesoscale, forming collectively across grains with complex local morphology propagating into bulk behavior. With the goal of describing twinning’s mesoscale behavior, we propose a model where twinning is treated using a phase-field approach, while slip is considered using crystal plasticity, with lattice reorientation, twinning length scale, and twin-slip interactions all accounted. We present GPU accelerated simulations on polycrystalline solids and summarize the insights gained from these studies and the implications on the macroscale behavior of hcp materials.

Item Type:Book Section
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URLURL TypeDescription ReadCube access
Ocegueda, Eric0000-0001-7845-6890
Bhattacharya, Kaushik0000-0003-2908-5469
Additional Information:© The Minerals, Metals & Materials Society 2022. We gratefully acknowledge discussions with Hao Zhou on the development of the numerical method. The research was sponsored by the Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-12-2-0022. 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.
Funding AgencyGrant Number
Army Research LaboratoryW911NF-12-2-0022
Subject Keywords:Phase field; Deformation twinning; Crystal plasticity; GPU acceleration; Polycrystalline solids
Record Number:CaltechAUTHORS:20220207-702194000
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113311
Deposited By: George Porter
Deposited On:07 Feb 2022 21:56
Last Modified:07 Feb 2022 21:56

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