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MM: Fachverband Metall- und Materialphysik

MM 18: Poster Session I

MM 18.31: Poster

Montag, 16. März 2020, 18:15–20:00, P4

Study of the evaluation of NanoBeam Electron Diffraction Patterns from Bulk Metallic Glasses — •Manuel Lindenblatt, Martin Peterlechner, and Gerhard Wilde — Institute of Materials Physics, University of Münster, Germany

An approach to obtain knowledge about the properties of a material is to analyze its structure with diffraction experiments such as in a transmission electron microscope (TEM) done with electron diffraction. Using these experiments to evaluate the structure of a metallic glass proves to be a challenge, since no long range order (LRO) is available. However, the structure of glasses may be characterized by the specific medium range order (MRO) that is present. One possibility to analyze the MRO to evaluate a nanobeam electron diffraction pattern (NBDP) concerning the radial distribution function (RDF).

With the sample being a bulk metallic glass (Vitreloy105, Zr_52.5Cu_17.9Ni_14.6Al₁₀Ti₅ in at%) the focus of the present work is on analyzing the MRO structure of a shear band via obtaining the NBDP (by [1]). This task was approached for each relating parameter individually at first. One significant improvement done by this work is a method to find reliable and reproducible center coordinates for any elliptical undistorted single NBDP. Another contribution relates to the measured background intensity. This work discusses the physical meaning of the parameters relating to the obtained RDFs and discusses also the reliability of information obtained through the RDF analysis concerning the real-space structure of glasses.

[1] S. Hilke et al, Acta Materialia, 171:275-281, 2019.