Grain boundary shear coupling is not a grain boundary property

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)241-247
Journal / PublicationActa Materialia
Volume167
Online published30 Jan 2019
Publication statusPublished - 1 Apr 2019

Abstract

Shear coupling implies that all grain boundary (GB) migration necessarily creates mechanical stresses/strains and is a key component to the evolution of all polycrystalline microstructures. We present MD simulation data and theoretical analyses that demonstrate the GB shear coupling is not an intrinsic GB property, but rather strongly depends on the type and magnitude of the driving force for migration and temperature. We resolve this apparent paradox by proposing a microscopic theory for GB migration that is based upon a statistical ensemble of line defects (disconnections) that are constrained to lie in the GB. Comparison with the MD results for several GBs provides quantitative validation of the theory of shear coupling factor as a function of stress, chemical potential jump and temperature.

Research Area(s)

  • Disconnection, Grain boundary, Molecular dynamics, Shear coupling, Thermodynamics

Citation Format(s)

Grain boundary shear coupling is not a grain boundary property. / Chen, Kongtao; Han, Jian; Thomas, Spencer L.; Srolovitz, David J.

In: Acta Materialia, Vol. 167, 01.04.2019, p. 241-247.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal