Direct observation of nanocrystal-induced enhancement of tensile ductility in a metallic glass composite

Author(s)
Christoph Gammer, Christian Rentenberger, Denise Beitelschmidt, Andrew M. Minor, Jürgen Eckert
Abstract

Bulk metallic glasses (BMGs) have attracted wide interest, but their successful application is hindered by their low ductility at room temperature. Therefore, the use of composites of a BMG matrix with crystalline secondary phases has been proposed to overcome this drawback. In the present work we demonstrate the fabrication of a tailored BMG nanocomposite containing a high density of monodisperse nanocrystals with a size of around 20 nm using a combination of mechanical and thermal treatment of Cu36Zr48Al8Ag8 well below the crystallization temperature. Direct observations of the interaction of the nanocrystals with a shear band during in situ deformation in a transmission electron microscope demonstrate that the achieved nanocomposite has the potential to inhibit catastrophic fracture in tension. This demonstrates that a sufficient number of nanoscale structural heterogeneities can be a route towards BMG composites with superior mechanical properties.

Organisation(s)
Physics of Nanostructured Materials
External organisation(s)
Österreichische Akademie der Wissenschaften (ÖAW), Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Lawrence Berkeley National Laboratory, Montanuniversität Leoben, University of California, Berkeley
Journal
Materials and Design
Volume
209
No. of pages
6
ISSN
0264-1275
DOI
https://doi.org/10.1016/j.matdes.2021.109970
Publication date
11-2021
Peer reviewed
Yes
Austrian Fields of Science 2012
103042 Electron microscopy, 103018 Materials physics
Keywords
ASJC Scopus subject areas
Mechanics of Materials, Mechanical Engineering, Materials Science(all)
Portal url
https://ucris.univie.ac.at/portal/en/publications/direct-observation-of-nanocrystalinduced-enhancement-of-tensile-ductility-in-a-metallic-glass-composite(fa24a10d-cc5e-4bb9-83fd-a867cd90e285).html