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

Jonas Kjeldsen, Morten Mattrup Smedskjær, J. C. Mauro, Yuanzheng Yue

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27 Citationer (Scopus)

Abstrakt

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.
OriginalsprogEngelsk
TidsskriftJournal of Non-Crystalline Solids
Vol/bind406
Sider (fra-til)22-26
Antal sider5
ISSN0022-3093
DOI
StatusUdgivet - 2014

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