|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale IV
||Anatomizing Deformation Mechanisms in Metals at the Low End of the Nanoscale
||Rainer Birringer, Christian Braun, Michael Deckarm, Andreas Leibner
|On-Site Speaker (Planned)
For plastic deformation at grain sizes around 10 nm, we identify the strain carrying deformation modes using x-ray diffraction and electron microscopy. Applying rising load, we quantify how these modes contribute to overall strain. In a case study on NC PdAu alloys with grain sizes below 10 nm, we determined activation energy, shear activation volume and shear dilatation to identify and discriminate deformation mechanisms. In-situ deformation and diffraction is exploited to unravel the interplay of relevant mechanisms and their evolution up to large plastic strains. The unexpected observation of solid solution softening can be shown to has its origin in deformation modes related to grain boundaries and their shear softening. Grain boundary mediated deformation seems to dominate the overall deformation behavior at the low end of the naoscale. Mechanistically, it bears great similarities with shear transformations,the generic flow event in metallic glasses.
||Planned: Supplemental Proceedings volume