Berlin 2018 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 44: Topical Session (Symposium EPS and MM): Mechanical Properties at Small Scales

MM 44.1: Topical Talk

Mittwoch, 14. März 2018, 17:00–17:30, H 0107

Atomistic plasticity mechanisms in metallic glass thin films : new insights from advanced transmission electron microscopy — •Hosni Idrissi¹, Matteo Ghidelli^1,3,4,5, Sebastien Gravier⁴, Jean-Jacques Blandin⁴, Jean-Pierre Raskin³, Dominique Schryvers², and Thomas Pardoen¹ — ¹Institute of Mechanics, Materials and Civil Engineering. Université Catholique de Louvain. Louvain-la-Neuve. Belgium — ²Electron Microscopy for Materials Science (EMAT). University of Antwerp. Antwerp. Belgium — ³Institute of Information and Communication Technologies, Electronics and Applied Mathematics. Université Catholique de Louvain. Louvain-la-Neuve. Belgium — ⁴Science and Engineering of Materials and Processes, SIMaP. Université de Grenoble. Grenoble. France — ⁵Micro- and Nanostructured Materials Laboratory, Department of Energy, Politecnico di Milano. Milano. Italy

Although intensive research on the deformation and fracture mechanisms has been performed on metallic glasses (MGs), the fundamental mechanisms governing the mechanical behaviour as well as the recently observed mechanical size effects in this class of materials are still not fully understood. In the present study, quantitative nanobeam electron diffraction and aberration corrected TEM techniques have been used to investigate the elementary plasticity mechanisms activated in amorphous ZrNi freestanding thin film MGs exhibiting exceptional mechanical properties uncharacteristic of metallic glasses with a yield strength close to the theoretical value (3 GPa), as well as highly enhanced ductility (up to 15%!).