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Metastable quasicrystal-induced nucleation in a bulk glass-forming liquid

Kurtuldu, Güven, Shamlaye, Karl F. and Löffler, Jörg F. 2018, Metastable quasicrystal-induced nucleation in a bulk glass-forming liquid, Proceedings of the National Academy of Sciences of the United States of America, vol. 115, no. 24, pp. 6123-6128, doi: 10.1073/pnas.1717941115.

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Title Metastable quasicrystal-induced nucleation in a bulk glass-forming liquid
Author(s) Kurtuldu, Güven
Shamlaye, Karl F.ORCID iD for Shamlaye, Karl F. orcid.org/0000-0003-1114-8468
Löffler, Jörg F.
Journal name Proceedings of the National Academy of Sciences of the United States of America
Volume number 115
Issue number 24
Start page 6123
End page 6128
Total pages 6
Publisher National Academy of Sciences
Place of publication Washington, D.C.
Publication date 2018-06-12
ISSN 0027-8424
1091-6490
Keyword(s) bulk metallic glass
fast differential scanning calorimetry
metastable
nucleation
quasicrystal
Summary This study presents a unique Mg-based alloy composition in the Mg-Zn-Yb system which exhibits bulk metallic glass, metastable icosahedral quasicrystals (iQCs), and crystalline approximant phases in the as-cast condition. Microscopy revealed a smooth gradual transition from glass to QC. We also report the complete melting of a metastable eutectic phase mixture (including a QC phase), generated via suppression of the metastable-to-stable phase transition at high heating rates using fast differential scanning calorimetry (FDSC). The melting temperature and enthalpy of fusion of this phase mixture could be measured directly, which unambiguously proves its metastability in any temperature range. The kinetic pathway from liquid state to stable solid state (an approximant phase) minimizes the free-energy barrier for nucleation through an intermediate state (metastable QC phase) because of its low solid- liquid interfacial energy. At high undercooling of the liquid, where diffusion is limited, another approximant phase with near-liquid composition forms just above the glass-transition temperature. These experimental results shed light on the competition between metastable and stable crystals, and on glass formation via system frustration associated with the presence of several free-energy minima.
Language eng
DOI 10.1073/pnas.1717941115
Indigenous content off
Field of Research MD Multidisciplinary
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2018, National Academy of Sciences
Free to Read? Yes
Use Rights Creative Commons Attribution Non-Commercial No-Derivatives licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30128593

Document type: Journal Article
Collections: Institute for Frontier Materials
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.