Journal
ACTA MATERIALIA
Volume 60, Issue 5, Pages 2007-2020Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2012.01.001
Keywords
Grain boundary shear; Grain boundary migration; Grain boundary dislocations; Disconnections
Funding
- Spanish Ministry of Science and Innovation [FIS2009-13641-C02-02]
- Catalan Government [CIRIT 2009SGR 1003]
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The mechanism of coupled migration and shear is studied in a range of [0001] tilt boundaries in hexagonal close-packed metal using atomic-scale computer simulation. Symmetrical tilt boundaries spanning the low- and high-angle regimes and comprising regular arrays of grain boundary dislocations are simulated. For each misorientation, theta, the perfect boundary (pristine) is investigated as well as one containing a disconnection. Both types of structures are subjected to incremental applied strains to determine the stress that produces coupled migration and shear. The stress for motion in the pristine case, entailing nucleation, is higher than the Peierls stress for motion when disconnections are present. We conclude that the applied stresses in our simulations exert a Peach-Koehler force on pre-existing disconnections, thereby providing a feasible mechanism with a well-defined driving force that produces coupled migration and shear. This mechanism is feasible for the lower-angle boundaries studied, and facile for the high-angle cases. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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