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MM: Fachverband Metall- und Materialphysik
MM 9: Liquid and Amorphous Metals - Brittle-to-ductile Transition
MM 9.2: Vortrag
Montag, 16. März 2020, 12:00–12:15, IFW D
How does a Cu-Zr-Al glass/crystal composite form in real time? — •Jiri Orava1, Ivan Kaban1, Xiaoliang Han1, Olga Shuleshova1, Ivan Soldatov2, Olof Gutowski3, Ann-Christin Dippel3, Martin v. Zimmermann3, Shanoob Balachandran4, Michael Herbig4, Yurii Ivanov5, Alan L. Greer5, and Dierk Raabe4 — 1IFW Dresden, Germany — 2IFW Dresden, Germany — 3DESY, Hamburg, Germany — 4MPIE, Düsseldorf, Germany — 5Department of Materials Science and Metallurgy, University of Cambridge, UK
Metallic glasses (MGs) have poor ductility, and due to the lack of atomic periodicity and microstructure, MGs mechanical properties cannot be controlled the same way as in crystalline materials. One approach to enhance ductility of MGs lies in introducing ductile nanometre-to-micrometre-size crystalline phases into a glass. This method has proven to be an effective way to improve the mechanical properties of such composites, particularly their plastic formability. We present a real time in-situ high-energy x-ray diffraction study of phases evolution during a controlled rapid-heating treatment, imposed at a rate ranging from ~100-1000 K/s, and subsequent cooling of a Cu-Zr-Al metallic glass. We combine the synchrotron measurements with in-situ heating in TEM and with atom-probe tomography analysis of the final composite microstructures. The formation of crystalline phases beneficial to the ductility are clearly resolved and conditions under which these phases develop are formulated. We thank the DFG, contracts Ka-3209/9-1 and HE 7225/1-1, for funding.