Hardness and incipient plasticity in silicate glasses: Origin of the mixed modifier effect

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

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

30 Citationer (Scopus)

Resumé

The scaling of Vickers hardness (Hv) in oxide glasses with varying network modifier/modifier ratio is manifested as either a positive or negative deviation from linearity with a maximum deviation at the ratio of about 1:1. In an earlier study [J. Kjeldsen et al., J. Non-Cryst. Solids 369,61(2013)], we observed a minimum ofHv in CaO/MgO sodium aluminosilicate glasses at CaO/MgO = 1:1 and postulated that this minimum is linked to a maximum in plastic flow. However, the origin of this link has not been experimentally verified. In this work, we attempt to do so by exploring the links among Hv, volume recovery ratio (VR), and plastic deformation volume (VP) under indentation, glass transition temperature (Tg), Young’s modulus (E), and liquid fragility index (m) in CaO/MgO and CaO/Li2O sodium aluminosilicate glasses. We confirm the negative deviations from linearity and find that the maximum deviation (i.e., the so-called mixed modifier effect) of Hv, Tg, and m is at the modifier ratio of 1:1. These deviations increase in intensity as the total modifier concentration
18 increases. We find a strong correlation between VPandHvfor the CaO/MgO series, implying that the minimum in Hv originates primarily from an increased shear flow in the mixed modifier glasses.
OriginalsprogEngelsk
Artikelnummer051913
TidsskriftApplied Physics Letters
Vol/bind104
Udgave nummer5
Antal sider4
ISSN0003-6951
DOI
StatusUdgivet - 2014

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plastic properties
silicates
hardness
deviation
glass
linearity
sodium
Vickers hardness
plastic flow
indentation
shear flow
glass transition temperature
plastic deformation
modulus of elasticity
recovery
scaling
oxides
liquids

Citer dette

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title = "Hardness and incipient plasticity in silicate glasses: Origin of the mixed modifier effect",
abstract = "The scaling of Vickers hardness (Hv) in oxide glasses with varying network modifier/modifier ratio is manifested as either a positive or negative deviation from linearity with a maximum deviation at the ratio of about 1:1. In an earlier study [J. Kjeldsen et al., J. Non-Cryst. Solids 369,61(2013)], we observed a minimum ofHv in CaO/MgO sodium aluminosilicate glasses at CaO/MgO = 1:1 and postulated that this minimum is linked to a maximum in plastic flow. However, the origin of this link has not been experimentally verified. In this work, we attempt to do so by exploring the links among Hv, volume recovery ratio (VR), and plastic deformation volume (VP) under indentation, glass transition temperature (Tg), Young’s modulus (E), and liquid fragility index (m) in CaO/MgO and CaO/Li2O sodium aluminosilicate glasses. We confirm the negative deviations from linearity and find that the maximum deviation (i.e., the so-called mixed modifier effect) of Hv, Tg, and m is at the modifier ratio of 1:1. These deviations increase in intensity as the total modifier concentration18 increases. We find a strong correlation between VPandHvfor the CaO/MgO series, implying that the minimum in Hv originates primarily from an increased shear flow in the mixed modifier glasses.",
author = "Jonas Kjeldsen and Smedskj{\ae}r, {Morten Mattrup} and Mauro, {John C.} and Yuanzheng Yue",
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Hardness and incipient plasticity in silicate glasses : Origin of the mixed modifier effect. / Kjeldsen, Jonas; Smedskjær, Morten Mattrup; Mauro, John C.; Yue, Yuanzheng.

I: Applied Physics Letters, Bind 104, Nr. 5, 051913, 2014.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Hardness and incipient plasticity in silicate glasses

T2 - Origin of the mixed modifier effect

AU - Kjeldsen, Jonas

AU - Smedskjær, Morten Mattrup

AU - Mauro, John C.

AU - Yue, Yuanzheng

PY - 2014

Y1 - 2014

N2 - The scaling of Vickers hardness (Hv) in oxide glasses with varying network modifier/modifier ratio is manifested as either a positive or negative deviation from linearity with a maximum deviation at the ratio of about 1:1. In an earlier study [J. Kjeldsen et al., J. Non-Cryst. Solids 369,61(2013)], we observed a minimum ofHv in CaO/MgO sodium aluminosilicate glasses at CaO/MgO = 1:1 and postulated that this minimum is linked to a maximum in plastic flow. However, the origin of this link has not been experimentally verified. In this work, we attempt to do so by exploring the links among Hv, volume recovery ratio (VR), and plastic deformation volume (VP) under indentation, glass transition temperature (Tg), Young’s modulus (E), and liquid fragility index (m) in CaO/MgO and CaO/Li2O sodium aluminosilicate glasses. We confirm the negative deviations from linearity and find that the maximum deviation (i.e., the so-called mixed modifier effect) of Hv, Tg, and m is at the modifier ratio of 1:1. These deviations increase in intensity as the total modifier concentration18 increases. We find a strong correlation between VPandHvfor the CaO/MgO series, implying that the minimum in Hv originates primarily from an increased shear flow in the mixed modifier glasses.

AB - The scaling of Vickers hardness (Hv) in oxide glasses with varying network modifier/modifier ratio is manifested as either a positive or negative deviation from linearity with a maximum deviation at the ratio of about 1:1. In an earlier study [J. Kjeldsen et al., J. Non-Cryst. Solids 369,61(2013)], we observed a minimum ofHv in CaO/MgO sodium aluminosilicate glasses at CaO/MgO = 1:1 and postulated that this minimum is linked to a maximum in plastic flow. However, the origin of this link has not been experimentally verified. In this work, we attempt to do so by exploring the links among Hv, volume recovery ratio (VR), and plastic deformation volume (VP) under indentation, glass transition temperature (Tg), Young’s modulus (E), and liquid fragility index (m) in CaO/MgO and CaO/Li2O sodium aluminosilicate glasses. We confirm the negative deviations from linearity and find that the maximum deviation (i.e., the so-called mixed modifier effect) of Hv, Tg, and m is at the modifier ratio of 1:1. These deviations increase in intensity as the total modifier concentration18 increases. We find a strong correlation between VPandHvfor the CaO/MgO series, implying that the minimum in Hv originates primarily from an increased shear flow in the mixed modifier glasses.

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