Benzine, Omar ; Bruns, Sebastian ; Pan, Z. ; Durst, Karsten ; Wondraczek, L. (2018)
Local deformation of glasses is mediated by rigidity fluctuation and granularity.
In: ChemRxiv : the Preprint Server for Chemistry
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2018 |
| Autor(en): | Benzine, Omar ; Bruns, Sebastian ; Pan, Z. ; Durst, Karsten ; Wondraczek, L. |
| Art des Eintrags: | Bibliographie |
| Titel: | Local deformation of glasses is mediated by rigidity fluctuation and granularity |
| Sprache: | Englisch |
| Publikationsjahr: | 4 Juni 2018 |
| Verlag: | ChemRxiv |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | ChemRxiv : the Preprint Server for Chemistry |
| URL / URN: | https://chemrxiv.org/articles/Local_Deformation_of_Glasses_I... |
| Kurzbeschreibung (Abstract): | 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. |
| Freie Schlagworte: | glasses, hardness values, Boson peak form, Mechanical properties, strength properties |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Physikalische Metallkunde |
| Hinterlegungsdatum: | 11 Feb 2019 06:34 |
| Letzte Änderung: | 07 Mär 2019 10:59 |
| PPN: | |
| Sponsoren: | This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (ERC grant UTOPES, grant agreement no. 681652)., Further financial support through the priority program PP 1594 of the German Science Foundation is gratefully acknowledged., The authors would like to thank Thierry Deschamps for providing BLS data. |
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