This article is cited in 5 papers

Metals

Grain-boundary shear-migration coupling in Al bicrystals. Atomistic modeling

L. E. Kar'kina^a, I. N. Kar'kin^a, A. R. Kuznetsov^ab, Yu. N. Gornostyrev<sup>ac

a</sup> Institute of Metal Physics, Ural Division of the Russian Academy of Sciences, Ekaterinburg
^b Ural Federal University, Ekaterinburg
^c Institute of Quantum Materials Science, Ekaterinburg

Abstract: The energy of grain boundary shears is calculated for symmetric grain boundaries (GBs) using ab initio methods and molecular-dynamic modeling in order to elucidate mechanisms that control GB shear-migration coupling in typical symmetric GBs, such as $\Sigma$3 (111), $\Sigma$5 (012), $\Sigma$5 (013) and $\Sigma$11 (113) tilt GBs, in Al bicrystal. The energy of generalized grain-boundary stacking faults (GB–SF) is determined, and the preferred directions and the energy barrier are established for grain-boundary slippage. It is shown that the relative slippage of neighboring grains at certain directions of particle shears is accompanied by conservative migration of GB in the direction perpendicular to its plain. The modeling data are comparative to known grain-boundary shear-migration coupling mechanisms in Al.

Received: 10.04.2018
Revised: 25.04.2018

DOI: 10.21883/FTT.2018.10.46511.099

 English version: Physics of the Solid State, 2018, 60:10, 1916–1923

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