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Dynamic aspects of dislocation motion: Atomistic simulations

: Bitzek, E.; Gumbsch, P.


Devincre, B.:
Dislocations 2004. An International Conference on the Fundamentals of Plastic Deformation : Held at La Colle-sur-Loup (French Riviera, France), September 13-17, 2004
Amsterdam: Elsevier, 2005 (Materials science & engineering. A, Structural materials: properties, microstructure and processing 400/401.2005)
International Conference on the Fundamentals of Plastic Deformation <2004, La Colle-sur-Loup, France>
Konferenzbeitrag, Zeitschriftenaufsatz
Fraunhofer IWM ()
dislocation drag; inertia; dislocation-obstacle interaction; atomistic simulation; line tension model

Atomistic simulations of accelerating edge and srew dislocations were carried out to study the dynamics of dislocations in a face centered cubic metal. Using two different embedded atom potentials for nickel and a simple slab geometry, the Peierls stress, the effective mass, the line tension and the drag coefficient were determined. A dislocation intersecting an array of voidas is used to study dynamic effects in dislocation-obstacle interactions. A pronounced effect caused by inertial overshooting is found. A dynamic line tension model is developed which reproduces the simulation results. The model can be used to easily estimate the magnitude of inertial effects in the interaction of dislocations with localized obstacles for different obstacle strengths, - spacings and temperatures.