Fabrication of Metastable Crystalline Nanocomposites by Flash Annealing of Cu47.5Zr47.5Al5 Metallic Glass Using Joule Heating

Ilya Okulov; Ivan Soldatov; Ivan Kaban; Baran Sarac; Florian Spieckermann; Jürgen Eckert

doi:10.3390/nano10010084

Fabrication of Metastable Crystalline Nanocomposites by Flash Annealing of Cu_47.5Zr_47.5Al₅ Metallic Glass Using Joule Heating

Nanomaterials (Basel). 2020 Jan 1;10(1):84. doi: 10.3390/nano10010084.

Authors

Ilya Okulov^{1

2}, Ivan Soldatov^{3

4}, Ivan Kaban³, Baran Sarac⁵, Florian Spieckermann⁶, Jürgen Eckert^{5

6}

Affiliations

¹ Faculty of Production Engineering, University of Bremen, Badgasteiner Street 1, 2, 28359 Bremen, Germany.
² Leibniz Institute for Materials Engineering-IWT, Badgasteiner Street 3, 28359 Bremen, Germany.
³ Leibniz Institute for Solid State and Materials Research IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany.
⁴ Institute of Natural Sciences and Mathematics, Ural Federal University, 620002 Yekaterinburg, Russia.
⁵ Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, 8700 Leoben, Austria.
⁶ Department of Materials Science, University of Leoben, Jahnstraße 12, 8700 Leoben, Austria.

Abstract

Flash Joule-heating was applied to the Cu_47.5Zr_47.5Al₅ metallic glass for designing fully crystalline metastable nanocomposites consisting of the metastable B2 CuZr and low-temperature equilibrium Cu₁₀Zr₇ phases. The onset of crystallization was in situ controlled by monitoring resistivity changes in the samples. The effect of heating rate and annealing time on the volume fraction of the crystalline phases and mechanical properties of the nanocomposites was studied in detail. Particularly, an increase of the heating rate and a decrease of the annealing time lead to a lower number of equilibrium Cu₁₀Zr₇ precipitates and an increase of tensile ductility. Tailoring of these non-equilibrium microstructures and mechanical properties may not be possible unless one starts with a fully glassy material that opens new perspectives for designing metastable nanomaterials with unique physical properties.

Keywords: flash annealing; mechanical behaviour; metallic glass; metastable material; nanocomposite.

Abstract

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