Influence of the Ag concentration on the medium-range order in a CuZrAlAg bulk metallic glass

Author(s)
Christoph Gammer, B. Escher, Christian Ebner, A. M. Minor, H. P. Karnthaler, J. Eckert, S. Pauly, C. Rentenberger
Abstract

Fluctuation electron microscopy of bulk metallic glasses of CuZrAl(Ag) demonstrates that medium-range order is sensitive to minor compositional changes. By analyzing nanodiffraction patterns medium-range order is detected with crystal-like motifs based on the B2 CuZr structure and its distorted structures resembling the martensitic ones. This result demonstrates some structural homology between the metallic glass and its high temperature crystalline phase. The amount of medium-range order seems slightly affected with increasing Ag concentration (0, 2, 5 at.%) but the structural motifs of the medium-range ordered clusters become more diverse at the highest Ag concentration. The decrease of dominant clusters is consistent with the destabilization of the B2 structure measured by calorimetry and accounts for the increased glass-forming ability.

Organisation(s)
Physics of Nanostructured Materials
Journal
Scientific Reports
Volume
7
No. of pages
7
ISSN
2045-2322
DOI
https://doi.org/10.1038/srep44903
Publication date
03-2017
Publication status
Published
Peer reviewed
Yes
Austrian Fields of Science 2012
103042 Electron microscopy, 103018 Materials physics
Keywords
CU-ZR-AL, FLUCTUATION ELECTRON-MICROSCOPY, FORMING-ABILITY, MECHANICAL-PROPERTIES, TRANSFORMATION, ADDITIONS, ALLOYS, COMPOSITE, DUCTILITY
Portal url
https://ucris.univie.ac.at/portal/en/publications/influence-of-the-ag-concentration-on-the-mediumrange-order-in-a-cuzralag-bulk-metallic-glass(d49d22d8-2f3c-4392-82c7-f4685ff69255).html