Berlin 2018 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 50: Topical session (Symposium EPS and MM): Mechanical Properties at Small Scales
MM 50.3: Vortrag
Donnerstag, 15. März 2018, 11:00–11:15, H 0106
Plasticity in three-point bent Au nanowires studied by in situ Laue micro-diffraction — •Thomas Cornelius1, Zhe Ren1, Gunther Richter2, and Olivier Thomas1 — 1Aix-Marseille Univ, Univ Toulon, CNRS, IM2NP UMR 7334, Marseille, France — 2Max-Planck Institute for Intelligent Systems, Stuttgart, Germany
In the recent past, in-situ experimental setups are being designed for monitoring the evolution of nanostructures during mechanical deformation. Compared to electron microscopy, X-ray diffraction has the benefit of being non-destructive, penetrating (no special need for sample pre-thinning) and extremely sensitive to elastic strains and defects. Thanks to the development of new synchrotron sources, increasingly efficient focusing optics, and advanced 2D detectors X-ray diffraction is becoming a major tool for investigating the structure of nano-objects in situ during mechanical deformation. In particular, Laue micro-diffraction with its high sensitivity on crystal orientation and geometrically necessary dislocations (GND) is a predestined method for in-situ nano-mechanical testing. Here, we present in-situ Laue microdiffraction studies on the plasticity of three-point bent Au nanowires revealing the activation of unexpected slip systems and the storage of GNDs in contrast to MD simulations that predict the formation of wedge-shaped twins in purely bent nano-beams which escape the crystal after unloading.