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MM: Fachverband Metall- und Materialphysik

MM 60: Nanomaterials IV - Deformation and mechanical properties

MM 60.2: Vortrag

Donnerstag, 3. April 2014, 16:00–16:15, IFW B

Glass-like characteristics of grain-boundary (GB) mediated plasticity in nanocrystalline (NC) PdAu alloys — •Andreas Leibner, Manuel Grewer, Christian Braun, Jonas Heppe, and Rainer Birringer — Universität des Saarlandes, FR 7.2 Experimentalphysik, Campus D2 2, 66123 Saarbrücken

There is ample evidence that at the low end of the nanoscale (<10nm), plastic deformation of NC metals manifests among other mechanisms in shear transformations (ST) that are confined to the core regions of GBs. On the other hand ST are the generic flow defect of metallic glasses. Therefore, it is in order to compare the deformation parameters of NC metals with appropriate counterparts in bulk metallic glasses (BMG).

Here we present a systematic investigation on the elastic properties and plastic behavior of NC PdAu with varying Au concentration and compare our results with solid solution strengthening / softening effects so far observed in nanoscale materials. However, drawing a conclusion, we emphasize an analogy to the deformation behavior in BMG.