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TECHNICAL PAPERS

Dislocation-Stacking Fault Tetrahedron Interactions in Cu

[+] Author and Article Information
B. D. Wirth, V. V. Bulatov, T. Diaz de la Rubia

Chemistry and Materials Science Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550

J. Eng. Mater. Technol 124(3), 329-334 (Jun 10, 2002) (6 pages) doi:10.1115/1.1479692 History: Received November 02, 2001; Revised March 06, 2002; Online June 10, 2002
Copyright © 2002 by ASME
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Figures

Grahic Jump Location
Schematic view of the simulation cell and dimensions used in this work
Grahic Jump Location
Near [1̄11] projection of MD simulation snapshots showing the motion of an isolated edge dislocation. The dislocation is visualized by plotting atoms with high potential energy. Dislocation positions are shown at (a) 0.0 ps, (b) 7.0 ps, (c) 15.0 ps, and (d) 20.5 ps after applying a 300 MPa shear stress.
Grahic Jump Location
Steady-state velocity of an edge dislocation as a function of the applied shear stress
Grahic Jump Location
[1̄11] projection of MD simulation snapshots showing the interaction between a moving, dissociated edge dislocation and an SFT, whose base lies just above the dislocation glide plane, as visualized by plotting atoms with high potential energy. Dislocation positions are shown at (a) 0.0 ps, (b) 9.0 ps, (c) 11.0 ps, (d) 14.0 ps, (e) 15.5 ps, and (f) 18.5 ps after applying a 300 MPa shear stress. Note, the use of high potential energy atoms for visualization introduces thermal noise (isolated points) into the snapshots.
Grahic Jump Location
Near [1̄11] projection of MD simulation snapshots showing the interaction between a moving, dissociated edge dislocation and an SFT which lies across the dislocation glide plane, as visualized by plotting atoms with high potential energy. Dislocation positions are shown at (a) 10.0 ps, (b) 19.5 ps, (c) 23.3 ps, and (d) 115.0 ps after applying a 300 MPa shear stress. Note, the edge dislocation has passed through the SFT six times, shearing the top portion of the SFT away from its truncated tetrahedron base.
Grahic Jump Location
MD simulation snapshots showing the interaction between a moving, dissociated edge dislocation and an overlapping, truncated SFT in Cu. The high potential energy atoms are visualized in 〈111〉 (top) and 〈110〉 (bottom) projections and show the motion of the two Shockley partials and interaction with the overlapping, truncated SFT at (a) 0, (b) 11.0, (c) 16.0, and (d) 19.0 ps after application of a 300 MPa shear stress. See text for additional details.

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