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Ferrari, A. |
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Schimpf, Christian |
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Dunser, M. |
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Thomas, Eric |
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Gecse, Zoltan |
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Tsrunchev, Peter |
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Della Ricca, Giuseppe |
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Cios, Grzegorz |
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Hohlmann, Marcus |
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Dudarev, A. |
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Mascagna, V. |
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Santimaria, Marco |
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Poudyal, Nabin |
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Piozzi, Antonella |
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Mørtsell, Eva Anne |
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Jin, S. |
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Noel, Cédric |
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Fino, Paolo |
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Mailley, Pascal |
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Meyer, Ernst |
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Zhang, Qi |
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Pfattner, Raphael | Brussels |
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Kooi, Bart J. |
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Babuji, Adara |
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Pauporte, Thierry |
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Hembree, William
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Publications (3/3 displayed)
- 2016Structural changes during a liquid-liquid transition in the deeply undercooled $%5Cmathrm{Zr_{58.5}Cu_{15.6}Ni_{12.8}Al_{10.3}Nb_{2.8}}$ bulk metallic glass forming meltcitations
- 2015Linking Structure to Fragility in Bulk Metallic Glass-Forming Liquidscitations
- 2015High temperature rheology of Zr-based bulk metallic glass forming liquids ; Hochtemperatur Rheologie von Zr-basierenden metallischen massivglasbildenden Flüssigkeiten
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High temperature rheology of Zr-based bulk metallic glass forming liquids ; Hochtemperatur Rheologie von Zr-basierenden metallischen massivglasbildenden Flüssigkeiten
Abstract
Metallic glasses are promising new materials due to their unique properties and near-net shape formability. Viscosity is a key kinetic parameter for understanding supercooled liquids. Good glass formers exhibit sluggish crystallization kinetics due to their slow atomic mobility or high viscosity. However, accurate viscosity measurements are challenging for these liquids, especially at high temperatures in the molten state. In this work, the temperature dependent rheological behavior of select zirconium based bulk metallic glasses is investigated using a custom built concentric cylinder rheometer. This device was designed, built, and programmed to measure molten metallic liquids with viscosities ranging from 10-1000 mPa s up to 1400 K. A suite of LabVIEW measurement controls and graphical data analysis was developed for this work. To verify the results from the Couette rheometer, containerless electrostatic and electromagnetic levitation measurements were used. Additionally, the kinetics near the glass transition were investigated using three point beam bending experiments. All eight alloys unambiguously exhibit Newtonian fragile behavior above their liquidus temperatures and strong behavior near their glass transition temperatures, suggesting the existence of a liquid-liquid transition between kinetically distinct phases in these systems. Direct observation of such a transition is precluded by crystallization or by experimental limitations. ; Metallische Gläser sind vielversprechende Materialen auf Grund ihrer einmaligen Eigenschaften und endkonturnahe Umformbarkeit. Die Viskosität beschreibt der Kinetik für unterkühlten Schmelze. Gute Glasbildner zeichnen sich als hochviskose Flüssigkeiten mit langsame Kristallisations-Kinetik. Genaue Viskositätsmessungen sind sehr anspruchsvoll, insbesondere bei hohen Temperaturen. In dieser Arbeit werden der temperaturabhängigen Viskositäten von ausgesuchten Zirkon-basierende Legierungen untersucht. Dafür werden ein konzentrische-Zylinder Rheometer konzipiert, gebaut, und ...