Dresden 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 18: Poster Session
MM 18.30: Poster
Montag, 31. März 2014, 18:00–20:00, P4
In-situ TEM fracture tests of nanoscale multilayers — •Christian Meckenhäuser, Andreas Kelling, Inga Knorr, Tobias Liese, Hans-Ulrich Krebs, and Cynthia A. Volkert — Institute for Materials Physics, Georg-August-University of Göttingen, Friedrich-Hund-Platz 1, Göttingen, Germany
Nanocomposite materials are commonly used in many different applications due to their unique combinations of material properties. Here, we try to understand the mechanism of fracture in nanocomposites and the influences of interfaces on fracture in order to learn how to separate nanoscale materials efficiently. By varying the layer thicknesses a possible length scale depend behavior of fracture in nanoscale multilayer systems can be tested. The multilayers consist of nanocrystalline Ti and amorphous ZrO2, both deposited by pulsed laser deposition. The mechanical properties of the multilayer samples have been determined using Berkovich indentation and microcompression tests. The interfaces of the multilayer system are very sharp and smooth and the layer thicknesses of each material can by varied between 10 and 100 nm resulting in a perfect set of different samples for the fracture tests. We deform these multilayers with a specially designed in-situ setup inside a TEM using an STM holder which allows for stable and controllable crack growth. Initial studies on samples with 100 nm thick layers show that the cracks form at a notch created with the FIB and run through the middle of a Ti layer. The crack may jump to a neighboring Ti layer by forming a shear band in the intervening ZrO2 layer. In this presentation we will show preliminary results of fracture tests.