Shear-coupled grain-boundary migration dependence on normal strain/stress

N. Combe, F. Mompiou, and M. Legros
Phys. Rev. Materials 1, 033605 – Published 10 August 2017

Abstract

In specific conditions, grain-boundary (GB) migration occurs in polycrystalline materials as an alternative vector of plasticity compared to the usual dislocation activity. The shear-coupled GB migration, the expected most efficient GB based mechanism, couples the GB motion to an applied shear stress. Stresses on GB in polycrystalline materials seldom have, however, a unique pure shear component. This work investigates the influence of a normal strain on the shear coupled migration of a Σ13(320)[001] GB in a copper bicrystal using atomistic simulations. We show that the yield shear stress inducing the GB migration strongly depends on the applied normal stress. Beyond, the application of a normal stress on this GB qualitatively modifies the GB migration: while the Σ13(320)[001] GB shear couples following the 110 migration mode without normal stress, we report the observation of the 010 mode under a sufficiently high tensile normal stress. Using the nudge elastic band method, we uncover the atomistic mechanism of this 010 migration mode and energetically characterize it.

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  • Received 28 April 2017
  • Revised 4 July 2017

DOI:https://doi.org/10.1103/PhysRevMaterials.1.033605

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

N. Combe*, F. Mompiou, and M. Legros

  • Centre d'Elaboration de Matériaux et d'Etudes Structurales, CNRS UPR 8011, 29 rue J. Marvig, BP 94347, 31055 Toulouse cedex 4, France and Université de Toulouse; UPS; F-31055 Toulouse, France

  • *nicolas.combe@cemes.fr

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Vol. 1, Iss. 3 — August 2017

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