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Composition and cooling-rate dependence of plastic deformation, densification, and cracking in sodium borosilicate glasses during pyramidal indentation

Malchow, P. and Johanns, K. E. and Möncke, D. and Korte-Kerzel, S. and Wondraczek, L. and Durst, K. (2015):
Composition and cooling-rate dependence of plastic deformation, densification, and cracking in sodium borosilicate glasses during pyramidal indentation.
In: Journal of Non-Crystalline Solids, ELSEVIER SCIENCE BV, Netherlands, pp. 97-109, 419, ISSN 00223093,
[Online-Edition: http://dx.doi.org/10.1016/j.jnoncrysol.2015.03.020],
[Article]

Abstract

Plastic deformation, densification, and cracking of sodium borosilicate (NBS) glasses were examined during indentation with a three-sided pyramidal indenter. Compositions of 74.0SiO(2)-10.0B(2)O(3)-16.0Na(2)O (NBS1), and 74.0SiO(2)-20.7B(2)O(3)-43Na(2)O-1.0Al(2)O(3) (NBS2) (mol%) were investigated. The effect of thermal history was additionally considered for the NBS2 composition, which lies near the boron anomaly line. Hardness, elastic modulus, and fracture toughness were estimated with instrumented indentation techniques. Atomic force microscopy (AFM), Raman micro-spectroscopy, and post-indent annealing experiments were used to analyze surface topographies, densification, and recovery of deformed material. The results indicate that NBS1 exhibits a greater hardness and elastic modulus, and undergoes less densification than the NBS2 glasses. Different casting conditions influenced the plastic deformation and onset of crack initiation in NBS2. Interpretation of fracture toughness measured by indentation is complicated by residual stresses, densification during contact and model assumptions. However, distinct differences in elastic modulus, plastic deformation and cracking between the glasses were noticeable. Such results and observations are discussed in terms of structural changes in the glass. (C) 2015 Elsevier B.V. All rights reserved.

Item Type: Article
Erschienen: 2015
Creators: Malchow, P. and Johanns, K. E. and Möncke, D. and Korte-Kerzel, S. and Wondraczek, L. and Durst, K.
Title: Composition and cooling-rate dependence of plastic deformation, densification, and cracking in sodium borosilicate glasses during pyramidal indentation
Language: English
Abstract:

Plastic deformation, densification, and cracking of sodium borosilicate (NBS) glasses were examined during indentation with a three-sided pyramidal indenter. Compositions of 74.0SiO(2)-10.0B(2)O(3)-16.0Na(2)O (NBS1), and 74.0SiO(2)-20.7B(2)O(3)-43Na(2)O-1.0Al(2)O(3) (NBS2) (mol%) were investigated. The effect of thermal history was additionally considered for the NBS2 composition, which lies near the boron anomaly line. Hardness, elastic modulus, and fracture toughness were estimated with instrumented indentation techniques. Atomic force microscopy (AFM), Raman micro-spectroscopy, and post-indent annealing experiments were used to analyze surface topographies, densification, and recovery of deformed material. The results indicate that NBS1 exhibits a greater hardness and elastic modulus, and undergoes less densification than the NBS2 glasses. Different casting conditions influenced the plastic deformation and onset of crack initiation in NBS2. Interpretation of fracture toughness measured by indentation is complicated by residual stresses, densification during contact and model assumptions. However, distinct differences in elastic modulus, plastic deformation and cracking between the glasses were noticeable. Such results and observations are discussed in terms of structural changes in the glass. (C) 2015 Elsevier B.V. All rights reserved.

Journal or Publication Title: Journal of Non-Crystalline Solids
Volume: 419
Publisher: ELSEVIER SCIENCE BV, Netherlands
Uncontrolled Keywords: Sodium borosilicate glass, Indentation, Plastic deformation, Cracking, Densification
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 25 Jan 2016 11:52
Official URL: http://dx.doi.org/10.1016/j.jnoncrysol.2015.03.020
Identification Number: doi:10.1016/j.jnoncrysol.2015.03.020
Funders: Financial support from the German Science Foundation through its priority program 1594 is gratefully acknowledged
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