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Atomistic simulation of sliding of [1010] tilt grain boundaries in Mg

Published online by Cambridge University Press:  31 January 2011

Hao Zhang
Hao Zhang*
Affiliation:
Department of Chemical and Materials Engineering, University of Alberta, Edmonton AB T6G 2V4, Canada
*
a) Address all correspondence to this author. e-mail: hao.zhang@ualberta.ca
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Abstract

A series of molecular dynamics simulations was performed to study grain boundary sliding of three types of [101¯0] tilt grain boundaries in a magnesium bicrystal. In particular, a near Σ11 twin boundary, an asymmetric near Σ11 twin boundary, and a θ = 40.3° general [101¯0] tilt grain boundary were studied. Simulations showed that grain boundary sliding (a rigid motion of two grains relative to each other along boundary plane) did not occur over the stress range applied; instead, coupled shear motion (grain boundary sliding induced boundary migration) was dominant. Although the measured coupling coefficient, the ratio of boundary tangential displacement to boundary normal displacement, was in good agreement with theoretical prediction, the detailed shear behavior was different, depending on types of grain boundary, magnitude of applied shear stress, and temperature. It was also noted that grain boundary twining was the predominant mechanism that allowed the coupled shear motion to occur in hexagonal close-packed (HCP) magnesium.

Keywords

Grain boundariesMgSimulation
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 11 , November 2009 , pp. 3446 - 3453
Copyright
Copyright © Materials Research Society 2009

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