Regensburg 2010 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 2: Topical Session Glass Dynamics II
MM 2.3: Vortrag
Montag, 22. März 2010, 12:45–13:00, H16
Deformation mechanisms in small samples of Pd77Si23 metallic glass — •Dominik Tönnies1, Frans Spaepen2, and Cynthia A. Volkert1 — 1Institut für Materialphysik, Georg-August-Universität Göttingen, Göttingen, Germany — 2School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
Bulk metallic glasses show some remarkable mechanical properties, but their poor plastic behavior at room temperature limits their use in applications. In recent studies, the size dependence of room temperature deformation mechanisms has been investigated by micro-compression tests on a Pd77Si23 metallic glass. The results show a clear transition from the expected mechanism of shear band formation to homogeneous deformation in pillars with diameters smaller than 440 nm. In an effort to understand the parameters that control this size transition, further micro-compression and nanoindentation studies have been performed on the Pd77Si23 films as a function of the extent of structural relaxation. The results show that in a relaxed sample the critical transition size for homogeneous deformation is reduced. The results will be discussed in terms of sample size-dependent shear band spacing and overlap.