Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 6: Mechanical Properties II

MM 6.1: Vortrag

Montag, 26. März 2012, 11:30–11:45, H 0106

Dislocation microstructure evolution and size effect during torsion of thin single crystalline metallic wires: a discrete dislocation dynamics approach — Jochen Senger and •Daniel Weygand — Karlsruhe Institute of Technology, IAM, Karlsruhe, Germany

The ground breaking investigations of Fleck [1] on the size dependence observed by applying torsion boundary constraints have – to the authors knowledge – not been addresses by 3D discrete dislocation dynamics (3DDD). Under torsion, the trend smaller is stronger has been found. This observation has been a motivation for strain gradients approaches. Despite this a detailed knowledge on the dislocation microstructure, characteristic for torsion is lacking. Therefore we report on the hardening with twist angle and on dislocation microstructures under twist loading and unloading for single crystals obtained by 3DDD [2].

[1] N. A. Fleck, G. M. Muller, M. F. Ashby, and J. W. Hutchinson. Acta Met. 42 (1994) 475.

[2] J. Senger, D. Weygand, O. Kraft, P. Gumbsch, Dislocation microstructure evolution in cyclically twisted microsamples: a discrete dislocation dynamics simulation, Modelling Simul. Mater. Sci. Eng. 19 (2011) 074004.