Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 34: Poster session II

MM 34.11: Poster

Dienstag, 21. März 2017, 18:30–20:30, P4

Deformation Mechanisms in Magnetron Sputtered Thin Film Metallic Glasses — •Marlene Mühlbacher¹, Christoph Gammer², Ruth Konetschnik¹, Thomas Schöberl², Christian Mitterer¹, and Jürgen Eckert^1,2 — ¹Montanuniversität Leoben, Franz-Josef-Strasse 18, 8700 Leoben, Austria — ²Erich Schmid Institute for Materials Science, Austrian Academy of Sciences, Jahnstrasse 12, 8700 Leoben, Austria

Amorphous metallic coatings have recently emerged as promising thin film materials due to their excellent chemical stability, good wear resistance and exceptionally high strength. Their mechanical behavior, however, is fundamentally different from their crystalline counterparts, due to the disordered structure lacking dislocations as carriers of plastic deformation. To investigate the different deformation mechanisms, we have synthesized Pd-based crystalline/amorphous multilayer systems by unbalanced dc magnetron sputtering. Hardness and Young's modulus of the multilayer systems are assessed by nanoindentation. Indents are evaluated by atomic force microscopy and scanning electron microscopy for a quick estimation of the coatings' response to plastic deformation. Micromechanical samples of selected systems are prepared in a focused ion beam instrument. Deformation mechanisms and their dependence on layer arrangement are then investigated with a particular emphasis on in-situ tensile testing and bending in the electron microscope. This approach allows for a direct comparison of plastic deformation through the movement of dislocations and shear bands in the crystalline and glassy layers, respectively.