Effects of a disconnection dipole on the shear-coupled grain boundary migration

Yaolin Guo; Jincheng Wang; Zhijun Wang; Junjie Li; Yujuan Yang; Yaohe Zhou

doi:10.1016/j.commatsci.2015.07.037

Effects of a disconnection dipole on the shear-coupled grain boundary migration

Yaolin Guo, Jincheng Wang, Zhijun Wang, Junjie Li, Yujuan Yang, Yaohe Zhou

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

Effects of a preexisting disconnection dipole on the migration of a Σ5(3¯10)/[001] grain boundary (GB) at low shear rates have been investigated by using the minimized bulk dissipation phase field crystal model. Simulation results show that the two disconnections play different roles during the process of shear-coupled GB migration via different behaviors regarding heterogeneous nucleation and propagation of disconnections. Specifically, the different roles can be attributed to their structural deviation from the equilibrated crystallographic structure caused by shear loading: one disconnection contributes to the onset of GB migration by heterogeneous nucleation of disconnections, while the other one slows down the corresponding GB migration dynamics through the impediment of homogeneous nucleation in the flat GB plane.

Original language	English
Pages (from-to)	253-257
Number of pages	5
Journal	Computational Materials Science
Volume	109
DOIs	https://doi.org/10.1016/j.commatsci.2015.07.037
State	Published - 1 Aug 2015

Keywords

Disconnection dipole
Grain boundary migration
Phase field crystal
Shear-coupled motion

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10.1016/j.commatsci.2015.07.037

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title = "Effects of a disconnection dipole on the shear-coupled grain boundary migration",

abstract = "Effects of a preexisting disconnection dipole on the migration of a Σ5(3¯10)/[001] grain boundary (GB) at low shear rates have been investigated by using the minimized bulk dissipation phase field crystal model. Simulation results show that the two disconnections play different roles during the process of shear-coupled GB migration via different behaviors regarding heterogeneous nucleation and propagation of disconnections. Specifically, the different roles can be attributed to their structural deviation from the equilibrated crystallographic structure caused by shear loading: one disconnection contributes to the onset of GB migration by heterogeneous nucleation of disconnections, while the other one slows down the corresponding GB migration dynamics through the impediment of homogeneous nucleation in the flat GB plane.",

keywords = "Disconnection dipole, Grain boundary migration, Phase field crystal, Shear-coupled motion",

author = "Yaolin Guo and Jincheng Wang and Zhijun Wang and Junjie Li and Yujuan Yang and Yaohe Zhou",

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T1 - Effects of a disconnection dipole on the shear-coupled grain boundary migration

AU - Guo, Yaolin

AU - Wang, Jincheng

AU - Wang, Zhijun

AU - Li, Junjie

AU - Yang, Yujuan

AU - Zhou, Yaohe

PY - 2015/8/1

Y1 - 2015/8/1

N2 - Effects of a preexisting disconnection dipole on the migration of a Σ5(3¯10)/[001] grain boundary (GB) at low shear rates have been investigated by using the minimized bulk dissipation phase field crystal model. Simulation results show that the two disconnections play different roles during the process of shear-coupled GB migration via different behaviors regarding heterogeneous nucleation and propagation of disconnections. Specifically, the different roles can be attributed to their structural deviation from the equilibrated crystallographic structure caused by shear loading: one disconnection contributes to the onset of GB migration by heterogeneous nucleation of disconnections, while the other one slows down the corresponding GB migration dynamics through the impediment of homogeneous nucleation in the flat GB plane.

AB - Effects of a preexisting disconnection dipole on the migration of a Σ5(3¯10)/[001] grain boundary (GB) at low shear rates have been investigated by using the minimized bulk dissipation phase field crystal model. Simulation results show that the two disconnections play different roles during the process of shear-coupled GB migration via different behaviors regarding heterogeneous nucleation and propagation of disconnections. Specifically, the different roles can be attributed to their structural deviation from the equilibrated crystallographic structure caused by shear loading: one disconnection contributes to the onset of GB migration by heterogeneous nucleation of disconnections, while the other one slows down the corresponding GB migration dynamics through the impediment of homogeneous nucleation in the flat GB plane.

KW - Disconnection dipole

KW - Grain boundary migration

KW - Phase field crystal

KW - Shear-coupled motion

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DO - 10.1016/j.commatsci.2015.07.037

M3 - 文章

AN - SCOPUS:84938581226

SN - 0927-0256

VL - 109

SP - 253

EP - 257

JO - Computational Materials Science

JF - Computational Materials Science

ER -

Effects of a disconnection dipole on the shear-coupled grain boundary migration

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Keywords

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