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

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 stru...

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Bibliographic Details
Published in:Scientific reports 2017-03, Vol.7 (1), p.44903-44903, Article 44903
Main Authors: Gammer, C., Escher, B., Ebner, C., Minor, A. M., Karnthaler, H. P., Eckert, J., Pauly, S., Rentenberger, C.
Format: Article
Language:English
Subjects:
639/301/1023/218
639/301/930/328/2082
Calorimetry
Electron microscopy
Glass
glasses
High temperature
Homology
Humanities and Social Sciences
MATERIALS SCIENCE
Mechanical properties
multidisciplinary
Science
Temperature effects
transmission electron microscopy
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Summary: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.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep44903