Regensburg 2019 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 9: Topical session (Symposium MM): Correlative and in-situ Microscopy in Materials Research
MM 9.3: Talk
Monday, April 1, 2019, 16:30–16:45, H44
The influence of deformation on the medium-range order of a Zr-based bulk metallic glass characterized by variable resolution fluctuation electron microscopy — •Sven Hilke1, Harald Rösner1, David Geißler2, Annett Gebert2, Martin Peterlechner1, and Gerhard Wilde1 — 1Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, D-48149 Münster, Germany — 2Institute for Complex Materials (IKM), Leibniz-Institute for Solid State and Materials Research Dresden (IFW Dresden) Helmholtzstr. 20, D-01069 Dresden, Germany
The medium-range order (MRO) of both as-cast and deformed states of a Zr-based bulk metallic glass (Zr52.5Cu17.9Ni14.6Al10Ti5 (at.-%) - Vitreloy 105) were analyzed using variable resolution fluctuation electron microscopy (VR-FEM). Significant structural changes were observed in the MRO in regions close to and inside shear bands of deformed material, compared with that in the as-cast state (un-deformed). As a result of deformation we conclude, that two distinct MRO cluster types were formed in both matrix and shear bands. Moreover, plastic deformation not only alters the MRO in terms of cluster size and volume fraction but also leads to a split into two distinct MRO types. The MRO length scale is larger inside the shear bands compared to the surrounding matrix, which indicates the impact of frictional heating and/or higher atomic mobility. Moreover, these results approve VR-FEM as a potential method for probing deformation stages even within the wide elastic regime of metallic glasses.