Regensburg 2013 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 36: Topical Session: TEM-Symposium - Structure-Property / In-Situ II

MM 36.2: Vortrag

Mittwoch, 13. März 2013, 12:00–12:15, H25

Ordering in deformed bulk metallic glasses studied by TEM — Christoph Gammer¹, Denise Beitelschmidt², Simon Pauly², David Geist¹, Jürgen Eckert², Hans-Peter Karnthaler¹, and •Christian Rentenberger¹ — ¹Universität Wien, Physik Nanostrukturierter Materialien, Boltzmanngasse 5, 1090 Wien, Austria — ²IFW Dresden, Institut für Komplexe Materialien, Helmholtzstraße 20, 01069 Dresden, Germany

Bulk metallic glasses are characterized by an amorphic atomic arrangement, still it is assumed that some medium range order (MRO) is present. This contributes to many outstanding properties as high strength, high elastic limits and in special cases combined with some plasticity. Despite intense research activities, the details of the structure are generally not well understood. Here we use transmission electron microscopy (TEM) methods to study the structure of an bulk metallic CuZrAlAg glass. The medium range order of the amorphous structure is unravelled experimentally using fluctuation electron microscopy that measures statistical fluctuations in the scattering of electrons as a function of spatial frequencies [1]. Based on this coarse graining TEM method the intensity fluctuations in dark-field images indicate the presence of B2 like medium range order. The differences in the MRO of as cast and deformed bulk metallic CuZrAlAg glass are investigated.

[1] M.M.J. Treacy and J.M. Gibson, Acta Cryst. 52 (1996) 212.