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

Authors/others:Gammer, Christoph (Erich Schmid Institut für Materialphysik, Österreichische Akademie der Wissenschaften) Escher, B. (IFW Dresden, Institut für Komplexe Materialien) Ebner, ChristianMinor, A. M. (Lawrence Berkeley Natl Lab, Lawrence Berkeley National Laboratory, United States Department of Energy (DOE), Natl Ctr Elect Microscopy, Mol Foundry) Karnthaler, H. P.Eckert, J. (Österreichische Akademie der Wissenschaften (ÖAW)) Pauly, S. (IFW Dresden, Institut für Komplexe Materialien) Rentenberger, C.
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.
Number of pages:7
Date of publication:21.3.2017
Journal title:Scientific Reports
Digital Object Identifier (DOI):http://dx.doi.org/10.1038/srep44903
Publication Type:Article
Research Group Physics of Nanostructured Materials
Faculty of Physics

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