Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 4: Topical session: Dynamics, relaxation and deformation in deeply supercooled metallic liquids and glasses I - Structural Transitions

MM 4.4: Vortrag

Montag, 20. März 2017, 11:15–11:30, IFW A

Structural reordering in CuZr-based metallic glass via short term sub-Tg annealing — •Baran Sarac¹, Andrea Bernasconi², Jonathan Wright³, Mihai Stoica⁴, and Jürgen Eckert¹ — ¹Erich Schmid Institute of Materials Science, OeAW, Leoben, Austria — ²Dept. of Chemistry University of Pavia, Pavia, Italy — ³ESRF-The European Synchrotron, Grenoble, France — ⁴ETH Zurich, Department of Materials, Zürich, Switzerland

This work highlights the structural reordering and nanocrystallization behaviour of a recently in-house developed Cu46Zr44Al8Hf2 bulk metallic glass upon short term sub-glass transition annealing. This special type of heat treatment process generated work hardening confirmed by three-point bend tests. Structural reordering is investigated via high energy synchrotron X-ray diffraction (λ = 0.01239 nm), and compare the results with the structural modifications obtained from transmission electron microscopy (TEM) and conventional X-ray diffraction with Co Kα radiation (λ = 0.01789 nm). 2D diffraction image displays remarkable diffraction spots from different phases, where the total structure factor S(Q) tends to decrease upon heat treatment. Real-space pair distribution function (PDF) analysis reveals the peak shifts and thereby, changes within the short- to medium-range ordering. The changes in the average coordination number and distances between atom pairs upon annealing is studied from the first coordination shell of the radial distribution function (RDF), where the Gaussian fitting provided us the dominant atom pairs within the as-cast state and the annealed metallic glass.