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Modeling the motion of edge dislocations in aluminum under high shear strains using molecular dynamics
Russian version
Sugonyako I. S. 1, Babicheva R. I. 2,3, Morkina A. Y. 1,3,4, Tarov D. V. 3, Dmitriev S. V. 1,2
1Ufa State Petroleum Technological University, Ufa, Russia
2Institute of Molecule and Crystal Physics, Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, Ufa, Russia
3Ufa University of Science and Technology, Ufa, Russia
4Institute for Metal Superplasticity Problems, Russian Academy of Sciences, Ufa, Bashkortostan, Russia
Email: sgnilya@mail.ru, ri.babicheva@gmail.com, alinamorkina@yandex.ru, tarovdv@gmail.com, dmitriev.sergey.v@gmail.com
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The molecular dynamics method is used to study the motion of a pair of edge dislocations of opposite signs in a single crystal of aluminum with an fcc lattice under different shear stresses and temperatures. The dimensions of the computational cell with periodic boundary conditions in all three directions are chosen so that the dislocations do not interact with each other. The range of sufficiently large shear stresses is studied, when the above-barrier slip of dislocations is realized and their velocity decreases with increasing temperature due to an increase in viscous friction. The stacking fault energy is calculated and the oscillation frequency of the dislocation line is estimated. The obtained results are consistent with the known results of modeling and experimental data, and can be used to interpret the electroplasticity effect. Keywords: molecular dynamics, edge dislocation, shear stresses, aluminum, Peierls-Nabarro potential.
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