Regensburg 2007 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 39: Mechanical properties I

MM 39.3: Vortrag

Donnerstag, 29. März 2007, 16:45–17:00, H6

Atomistic simulations of the dislocation motion in Fe with solute atoms — •Christopher Kohler and Siegfried Schmauder — Institut für Materialprüfung, Werkstoffkunde und Festigkeitslehre, Universität Stuttgart, Pfaffenwaldring 32, 70569 Stuttgart, Germany

Solute atoms in metals lead to a strengthening effect by impeding the motion of dislocations. This results from a short-range interaction of the solutes with the dislocation cores as well as from a long-range interaction of a distribution of many solutes with the dislocations. Molecular dynamics (MD) simulations with empirical interatomic potentials, e.g. EAM potentials, are a suitable method to model the dislocation-solute interaction at the atomic scale. In this talk, results of MD simulations of solid-solution strengthening in α-Fe are presented. The gliding of dislocations under the influence of an applied shear stress and at different temperatures is studied for random distributions and specific configurations of solute atoms. The effect of solute atmospheres around the dislocation core is also investigated.