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Atomistic study of drag, surface and inertial effects on edge dislocations in face-centered cubic metals

: Bitzek, E.; Gumbsch, P.


Materials Science and Engineering, A. Structural materials, properties, microstructure and processing 387-389 (2004), S.11-15
ISSN: 0921-5093
ISSN: 1873-4936
International Conference on the Strength of Materials (ICSMA) <13, 2003, Budapest>
Zeitschriftenaufsatz, Konferenzbeitrag
Fraunhofer IWM ()
dislocation dynamic; dislocation inertia; atomistic simulation; surface

Atomistic simulations of an accelerating edge dislocation were carried out to study the effects of drag and inertia. Using an embedded atom potential for nickel, the Peierls stress, the effective mass and the drag coefficient of an edge dislocation were determined for different temperatures and stresses in a simple slab geometry. The effect of {1 1 1} surfaces on an intersecting edge dislocation were studied by appropriately cutting the slab. A dislocation intersecting a surface stap was used as a model system to demonstrate the importance of inertial effects for dynamically overcoming short range obstacles. Significant effects were found even at room temperature. A simple model based on the dislocation-obstacle interaction energies was used to describe the findings.