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Linking structure to fragility in bulk metallic glass-forming liquids

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https://ir.library.oregonstate.edu/concern/articles/hd76s1729

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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[subscript 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.
  • Article Copyright 2015 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The published article can be found at: http://scitation.aip.org/content/aip/journal/apl
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  • Wei, S., Stolpe, M., Gross, O., Evenson, Z., Gallino, I., Hembree, W., ... & Busch, R. (2015). Linking structure to fragility in bulk metallic glass-forming liquids. Applied physics letters, 106(18), 181901. doi:10.1063/1.4919590
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  • 106
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  • 18
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  • Funding was partially supported by Alexander von Humboldt Foundation Feodor Lynen fellowship. Also, financial support from the Alexander von Humboldt Foundation Friedrich Wilhelm Bessel Research Award and the German Academic Exchange Service (DAAD). Research was partially funded by Project No. 16843N of the German Federation of Industrial Research Associations (AiF/IGF) and the Deutsche Forschungsgemeinschaft (German Research Foundation) through Grant No. GA 1721/2-1.
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