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MM: Fachverband Metall- und Materialphysik

MM 31: Postersitzung II

MM 31.53: Poster

Mittwoch, 16. März 2011, 17:15–18:45, P5

Examination of stress drops due to grain boundary motion in nanocrystalline PdAu-samples — •Michael Davis, Christian Braun, Manuel Grewer, and Rainer Birringer — Universität des Saarlandes, Saarbrücken, Deutschland

The miniaturized shear-specimen [1] allows one to examine the mechanical behaviour of nanocrystalline materials under dominant shear deformation. Due to the localisation of the plastic deformation in the gauge section, this samples geometry is particularly useful to study shear-stress driven grain boundary migration [2]. MD simulations predict a stick-slip-like deformation manifesting as stress drops in the force-displacement-diagram. In order to elucidate stick-slip behaviour, we probe the shear deformation in the gauge with high resolution optical displacement measurements. [1] M. Ames, J. Markmann, R. Birringer, Mater. Sci.Eng. A 528, 526 (2010), [2] J. W. Cahn, Y. Mishin, A. Suzuki, Acta Mat. 54,4953 (2006)