Journal
APPLIED PHYSICS LETTERS
Volume 106, Issue 18, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.4919590
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Funding
- Alexander von Humboldt Foundation Feodor Lynen fellowship
- Alexander von Humboldt Foundation Friedrich Wilhelm Bessel Research Award
- German Academic Exchange Service (DAAD)
- German Federation of Industrial Research Associations (AiF/IGF) [16843N]
- Deutsche Forschungsgemeinschaft (German Research Foundation) [GA 1721/2-1]
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Using in-situ synchrotron X-ray scattering, we show that the structural evolution of various bulk metallic glass-forming liquids can be quantitatively connected to their viscosity behavior in the supercooled liquid near T-g. The structural signature of fragility is identified as the temperature dependence of local dilatation on distinct key atomic length scales. A more fragile behavior results from a more pronounced thermally induced dilatation of the structure on a length scale of about 3 to 4 atomic diameters, coupled with shallower temperature dependence of structural changes in the nearest neighbor environment. These findings shed light on the structural origin of viscous slowdown during undercooling of bulk metallic glass-forming liquids and demonstrate the promise of predicting the properties of bulk metallic glasses from the atomic scale structure. (C) 2015 AIP Publishing LLC.
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