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BPHardnessSilica_Wondraczek.pdf (720.79 kB)
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Local Deformation of Glasses Is Mediated by Rigidity Fluctuation and Granularity

preprint
submitted on 04.06.2018 and posted on 04.06.2018 by Omar Benzine, Sebastian Bruns, Zhiwen Pan, Karsten Durst, Lothar Wondraczek
Microscopic deformation processes lie at the origin of defect formation on glass surfaces, thus determining the material’s resistance to scratching and mechanical failure. While the macroscopic strength of most glasses is not directly depending on material composition, local deformation and flaw initiation are strongly affected by chemistry and atomic arrangement. Aside empirical insight, however, the structural origin of the fundamental deformation modes remains largely unknown. Experimental methods which probe parameters on short or intermediate length-scale such as atom-atom or super-structural correlations are typically applied in the absence of alternatives. Drawing on recent experimental advances, we now probe spatial variations in the low-frequency vibrational density of states which result from sharp contact deformation of vitreous silica. From direct observation of deformation-induced variations on the characteristic length-scale of molecular heterogeneity, we argue that rigidity fluctuation on the scale of a few nanometers governs the deformation process of inorganic glasses.

Funding

EU H2020 ERC 681652

History

Email Address of Submitting Author

lothar.wondraczek@uni-jena.de

Institution

Friedrich Schiller University of Jena

Country

Germany

ORCID For Submitting Author

0000-0002-0747-3076

Declaration of Conflict of Interest

n.a.

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