TY - JOUR
T1 - Decoupling of indentation modulus and hardness in silicate glasses
T2 - Evidence of a shear- to densification-dominated transition
AU - Kazembeyki, Maryam
AU - Yang, Kai
AU - Mauro, John C.
AU - Smedskjaer, Morten M.
AU - Bauchy, Mathieu
AU - Hoover, Christian G.
N1 - Funding Information:
This work was supported by the National Science Foundation under Grants No. 1826050 and 1826420 . M.M.S. acknowledges support from VILLUM FONDEN (grant no. 13253 ).
Publisher Copyright:
© 2020
PY - 2021/2/1
Y1 - 2021/2/1
N2 - Prediction of the composition dependence of Calcium aluminosilicate (CAS) glasses mechanical properties is essential to aid in the development of new glasses with tuned properties for specific applications. In this investigation, we use microindentation to measure the hardness (H) and modulus (M) and the inelastic volume that dissipates the inelastic energy is elucidated using annealing and AFM to decompose it into contributions from densification and shear flow. We chose a family of CAS glasses with a constant CaO/Al2O3 ratio but varying SiO2 content, as well as a commercial >99% SiO2 glass. We observe a decoupling between M & H, M systematically decreases upon increasing SiO2 content, however, H exhibits a non-monotonic behavior with a minimum around 79% SiO2. The inelastically deformed volumes show a high contribution from shear flow for SiO2-poor glasses and a high contribution of densification for SiO2-rich glasses, demonstrating a shear to densification dominated transition between these two extremes.
AB - Prediction of the composition dependence of Calcium aluminosilicate (CAS) glasses mechanical properties is essential to aid in the development of new glasses with tuned properties for specific applications. In this investigation, we use microindentation to measure the hardness (H) and modulus (M) and the inelastic volume that dissipates the inelastic energy is elucidated using annealing and AFM to decompose it into contributions from densification and shear flow. We chose a family of CAS glasses with a constant CaO/Al2O3 ratio but varying SiO2 content, as well as a commercial >99% SiO2 glass. We observe a decoupling between M & H, M systematically decreases upon increasing SiO2 content, however, H exhibits a non-monotonic behavior with a minimum around 79% SiO2. The inelastically deformed volumes show a high contribution from shear flow for SiO2-poor glasses and a high contribution of densification for SiO2-rich glasses, demonstrating a shear to densification dominated transition between these two extremes.
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U2 - 10.1016/j.jnoncrysol.2020.120518
DO - 10.1016/j.jnoncrysol.2020.120518
M3 - Article
AN - SCOPUS:85096392865
SN - 0022-3093
VL - 553
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
M1 - 120518
ER -