On the origin of the mixed alkali effect on indentation in silicate glasses

Jonas Kjeldsen, Morten M. Smedskjaer, John Mauro, Yuanzheng Yue

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The compositional scaling of Vickers hardness (Hv) in mixed alkali oxide glasses manifests itself as a positive deviation from linearity as a function of the network modifier/modifier ratio, with a maximum deviation at the ratio of 1:1. In this work, we investigate the link between the indentation deformation processes (elastic deformation, plastic deformation, and densification) and Hv in two mixed sodium-potassium silicate glass series. We show that the mixed alkali effect in Hv originates from the nonlinear scaling of the resistance to plastic deformation. We thus confirm a direct relation between the resistance to plastic flow and Hv in mixed modifier glasses. Furthermore, we find that the mixed alkali effect also manifests itself as a positive deviation from linearity in the compositional scaling of density for glasses with high alumina content. This trend could be linked to a compaction of the network when two types of alkali ions co-exist.

Original languageEnglish (US)
Pages (from-to)22-26
Number of pages5
JournalJournal of Non-Crystalline Solids
Volume406
DOIs
StatePublished - Dec 15 2014

Fingerprint

Silicates
Alkalies
indentation
Indentation
alkalies
silicates
Glass
glass
deviation
scaling
plastic deformation
linearity
Plastic deformation
potassium silicates
sodium silicates
Vickers hardness
Aluminum Oxide
plastic flow
elastic deformation
Elastic deformation

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

Kjeldsen, Jonas ; Smedskjaer, Morten M. ; Mauro, John ; Yue, Yuanzheng. / On the origin of the mixed alkali effect on indentation in silicate glasses. In: Journal of Non-Crystalline Solids. 2014 ; Vol. 406. pp. 22-26.
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On the origin of the mixed alkali effect on indentation in silicate glasses. / Kjeldsen, Jonas; Smedskjaer, Morten M.; Mauro, John; Yue, Yuanzheng.

In: Journal of Non-Crystalline Solids, Vol. 406, 15.12.2014, p. 22-26.

Research output: Contribution to journalArticle

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