Equation of motion for grain boundaries in polycrystals

Abstract Grain boundary (GB) dynamics are largely controlled by the formation and motion of disconnections (with step and dislocation characters) along with the GB. The dislocation character gives rise to shear coupling; i.e. the relative tangential motion of two grains meeting at the GB during GB m...

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Autores principales:	Luchan Zhang, Jian Han, David J. Srolovitz, Yang Xiang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Computer software QA76.75-76.765
Acceso en línea:	https://doaj.org/article/c135088083ee453a9336a06747e1d4e8
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spelling	oai:doaj.org-article:c135088083ee453a9336a06747e1d4e82021-12-02T14:41:55ZEquation of motion for grain boundaries in polycrystals10.1038/s41524-021-00532-62057-3960https://doaj.org/article/c135088083ee453a9336a06747e1d4e82021-05-01T00:00:00Zhttps://doi.org/10.1038/s41524-021-00532-6https://doaj.org/toc/2057-3960Abstract Grain boundary (GB) dynamics are largely controlled by the formation and motion of disconnections (with step and dislocation characters) along with the GB. The dislocation character gives rise to shear coupling; i.e. the relative tangential motion of two grains meeting at the GB during GB migration. In a polycrystal, the shear coupling is constrained by the presence of other grains and GB junctions, which prevents large-scale sliding of one grain relative to the other. We present continuum equations of motion for GBs that is based upon the underlying disconnection dynamics and accounts for this mechanical constraint in polycrystals. This leads to a reduced-order (zero-shear constrained) model for GB motion that is easily implemented in a computationally efficient framework, appropriate for the large-scale simulation of the evolution of polycrystalline microstructures. We validated the proposed reduced-order model with direct comparisons to full multi-disconnection mode simulations.Luchan ZhangJian HanDavid J. SrolovitzYang XiangNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Computer softwareQA76.75-76.765ENnpj Computational Materials, Vol 7, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Computer software QA76.75-76.765
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Computer software QA76.75-76.765 Luchan Zhang Jian Han David J. Srolovitz Yang Xiang Equation of motion for grain boundaries in polycrystals
description	Abstract Grain boundary (GB) dynamics are largely controlled by the formation and motion of disconnections (with step and dislocation characters) along with the GB. The dislocation character gives rise to shear coupling; i.e. the relative tangential motion of two grains meeting at the GB during GB migration. In a polycrystal, the shear coupling is constrained by the presence of other grains and GB junctions, which prevents large-scale sliding of one grain relative to the other. We present continuum equations of motion for GBs that is based upon the underlying disconnection dynamics and accounts for this mechanical constraint in polycrystals. This leads to a reduced-order (zero-shear constrained) model for GB motion that is easily implemented in a computationally efficient framework, appropriate for the large-scale simulation of the evolution of polycrystalline microstructures. We validated the proposed reduced-order model with direct comparisons to full multi-disconnection mode simulations.
format	article
author	Luchan Zhang Jian Han David J. Srolovitz Yang Xiang
author_facet	Luchan Zhang Jian Han David J. Srolovitz Yang Xiang
author_sort	Luchan Zhang
title	Equation of motion for grain boundaries in polycrystals
title_short	Equation of motion for grain boundaries in polycrystals
title_full	Equation of motion for grain boundaries in polycrystals
title_fullStr	Equation of motion for grain boundaries in polycrystals
title_full_unstemmed	Equation of motion for grain boundaries in polycrystals
title_sort	equation of motion for grain boundaries in polycrystals
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/c135088083ee453a9336a06747e1d4e8
work_keys_str_mv	AT luchanzhang equationofmotionforgrainboundariesinpolycrystals AT jianhan equationofmotionforgrainboundariesinpolycrystals AT davidjsrolovitz equationofmotionforgrainboundariesinpolycrystals AT yangxiang equationofmotionforgrainboundariesinpolycrystals
_version_	1718389833532964864

Equation of motion for grain boundaries in polycrystals

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