ORCID Profile
0000-0002-1696-271X
Current Organisation
Saarland University
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Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 02-2020
Publisher: Elsevier BV
Date: 02-2019
Publisher: AIP Publishing
Date: 04-05-2015
DOI: 10.1063/1.4919590
Abstract: 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 Tg. 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.
Publisher: Springer Science and Business Media LLC
Date: 23-05-2013
Publisher: American Physical Society (APS)
Date: 29-05-2014
Publisher: Elsevier BV
Date: 2020
Publisher: Elsevier BV
Date: 02-2014
Publisher: Elsevier BV
Date: 02-2008
Publisher: Elsevier BV
Date: 27-10-2005
Publisher: AIP Publishing
Date: 30-07-2007
DOI: 10.1063/1.2766659
Abstract: Deformation of metallic glasses requires the existence of free volume to allow atomic movement under mechanical loading. Accordingly, quantification of the free volume state of the alloy is crucial to understand its mechanical behavior. By annealing below the glass transition temperature, the free volume of a Zr44Ti11Ni10Cu10Be25 bulk metallic glass was varied via structural relaxation. Differential scanning calorimetry was used to quantify enthalpy differences between the relaxed and as-cast materials, which were then quantitatively related to average free volume differences. These results can be used to characterize the average free volume in this alloy for future mechanical property studies.
Publisher: Elsevier BV
Date: 02-2011
Publisher: Elsevier BV
Date: 07-2015
Publisher: Elsevier BV
Date: 12-2020
Location: United States of America
No related grants have been discovered for Ralf Busch.