Linking structure to fragility in bulk metallic glass-forming liquids

Journal Article · Mon May 04 04:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4919590· OSTI ID:22398994

Wei, Shuai ^[1]; Stolpe, Moritz; Gross, Oliver; Gallino, Isabella; Hembree, William; Busch, Ralf ^[1]; Evenson, Zach ^[1]; Bednarcik, Jozef ^[2]; Kruzic, Jamie J. ^[3]

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1. Department of Materials Science and Engineering, Saarland University, Campus C63, 66123 Saarbrücken (Germany)
2. Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22603 Hamburg (Germany)
3. Material Science, School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, Oregon 97331 (United States)

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{sub 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.

• OSTI ID: 22398994
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 18 Vol. 106; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
LIQUIDS
METALLIC GLASSES
SLOWING-DOWN
SUBCOOLING
TEMPERATURE DEPENDENCE
VISCOSITY
VISIBLE RADIATION
X-RAY DIFFRACTION