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

Autor(en)

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

Abstrakt

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(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

Lawrence Berkeley National Laboratory, University of California, Berkeley, Österreichische Akademie der Wissenschaften (ÖAW), Montanuniversität Leoben, Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden

Journal

Scientific Reports

Band

7

Anzahl der Seiten

7

ISSN

2045-2322

DOI

https://doi.org/10.1038/srep44903

Publikationsdatum

03-2017

Peer-reviewed

Ja

ÖFOS 2012

103042 Elektronenmikroskopie, 103018 Materialphysik

Schlagwörter

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/d49d22d8-2f3c-4392-82c7-f4685ff69255