Indentation deformation in oxide glasses: Quantification, structural changes, and relation to cracking

Improving the fracture resistance of oxide glasses through adjustment of the chemical composition remains a challenging task, although composition-mechanical property relations have been established for simple model systems. The glass mechanical properties are, among other methods, conventionally te...

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Main Authors: Kacper Januchta, Morten M. Smedskjaer
Format: Article
Language:English
Published: Elsevier 2019-03-01
Series:Journal of Non-Crystalline Solids: X
Online Access:http://www.sciencedirect.com/science/article/pii/S2590159118300074
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spelling doaj-242fa30cb13b4702b0b12ce66412513b2020-11-24T22:12:25ZengElsevierJournal of Non-Crystalline Solids: X2590-15912019-03-011Indentation deformation in oxide glasses: Quantification, structural changes, and relation to crackingKacper Januchta0Morten M. Smedskjaer1Department of Chemistry and Bioscience, Aalborg University, Aalborg, DenmarkCorresponding author.; Department of Chemistry and Bioscience, Aalborg University, Aalborg, DenmarkImproving the fracture resistance of oxide glasses through adjustment of the chemical composition remains a challenging task, although composition-mechanical property relations have been established for simple model systems. The glass mechanical properties are, among other methods, conventionally tested using instrumented indentation, which is a fast and convenient technique that mimics the real-life damage for certain applications, although interpretation can be challenging due to the complex stress fields that develop under the indenter. Early indentation experiments have shown that oxide glasses exhibit pronounced tendency to densify under compressive load compared to metals and ceramics. After decades of investigations, it is now known that the extent of densification is strongly dependent on the glass' chemical composition and in turn its atomic packing density and Poisson's ratio. Spectroscopic techniques have shed light on the mechanism of densification, which include changes in the bond angle distributions as well as an increase in the coordination number of the network-forming cations. Knowledge of such details is crucial for understanding the link between chemical composition and resistance to cracking in oxide glasses, since densification is an efficient way to dissipate the elastic energy applied to the material during indentation. Here, we review the experimental work on identification and quantification of indentation deformation in glasses, as well as on probing the accompanying structural changes in the glassy network. We also include the conclusions drawn from computer simulation studies, which can provide atomistic details of the indentation deformation mechanisms. Finally, we discuss the link between the mechanism of deformation and the crack resistance. Keywords: Indentation, Oxide glasses, Cracking, Densification, Deformation mechanism, Stress fieldhttp://www.sciencedirect.com/science/article/pii/S2590159118300074
collection DOAJ
language English
format Article
sources DOAJ
author Kacper Januchta
Morten M. Smedskjaer
spellingShingle Kacper Januchta
Morten M. Smedskjaer
Indentation deformation in oxide glasses: Quantification, structural changes, and relation to cracking
Journal of Non-Crystalline Solids: X
author_facet Kacper Januchta
Morten M. Smedskjaer
author_sort Kacper Januchta
title Indentation deformation in oxide glasses: Quantification, structural changes, and relation to cracking
title_short Indentation deformation in oxide glasses: Quantification, structural changes, and relation to cracking
title_full Indentation deformation in oxide glasses: Quantification, structural changes, and relation to cracking
title_fullStr Indentation deformation in oxide glasses: Quantification, structural changes, and relation to cracking
title_full_unstemmed Indentation deformation in oxide glasses: Quantification, structural changes, and relation to cracking
title_sort indentation deformation in oxide glasses: quantification, structural changes, and relation to cracking
publisher Elsevier
series Journal of Non-Crystalline Solids: X
issn 2590-1591
publishDate 2019-03-01
description Improving the fracture resistance of oxide glasses through adjustment of the chemical composition remains a challenging task, although composition-mechanical property relations have been established for simple model systems. The glass mechanical properties are, among other methods, conventionally tested using instrumented indentation, which is a fast and convenient technique that mimics the real-life damage for certain applications, although interpretation can be challenging due to the complex stress fields that develop under the indenter. Early indentation experiments have shown that oxide glasses exhibit pronounced tendency to densify under compressive load compared to metals and ceramics. After decades of investigations, it is now known that the extent of densification is strongly dependent on the glass' chemical composition and in turn its atomic packing density and Poisson's ratio. Spectroscopic techniques have shed light on the mechanism of densification, which include changes in the bond angle distributions as well as an increase in the coordination number of the network-forming cations. Knowledge of such details is crucial for understanding the link between chemical composition and resistance to cracking in oxide glasses, since densification is an efficient way to dissipate the elastic energy applied to the material during indentation. Here, we review the experimental work on identification and quantification of indentation deformation in glasses, as well as on probing the accompanying structural changes in the glassy network. We also include the conclusions drawn from computer simulation studies, which can provide atomistic details of the indentation deformation mechanisms. Finally, we discuss the link between the mechanism of deformation and the crack resistance. Keywords: Indentation, Oxide glasses, Cracking, Densification, Deformation mechanism, Stress field
url http://www.sciencedirect.com/science/article/pii/S2590159118300074
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