Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 375, Issue -, Pages 47-54Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2013.04.063
Keywords
Phosphate glasses; Slow crack growth; Capillary condensation; Mixed mobile ion effect
Funding
- Deutsche Forschungsgemeinschaft (DFG) [SPP 1594]
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Corner cracks were initiated in a series of lithium-magnesium-metaphosphate glasses with different Li-to-Mg ratios by performing Vickers indentation under humid conditions (RH = 50% and RH = 65%) and in dry nitrogen gas atmosphere (RH = 0.01%). Propagation of each crack was observed up to 240 h. Distinct condensation of water at the crack-tip up to 30 gm occurred in humid environments, which led to a decrease in open crack length, while in dry nitrogen gas atmosphere this phenomenon was absent. A square root of time dependence was observed for the crack-tip condensation (CTC) kinetics as well as for weight gain experiments on crack-free glass specimens. Slow crack growth and CTC were dependent on the Li-to-Mg ratio of the glasses and showed a negative deviation from a linear compositional trend. Deviation of CTC was largest for glasses of Li-to-Mg ratio >2:1 indicating a mixed mobile ion effect beyond charge neutrality, while the fatigue resistance exhibited a maximum at concentrations of equal charge. On the other hand a positive deviation from additivity was found for hardness and Young's modulus indicating increased resistance against elastic and plastic deformation for glass compositions of mixed Li+ and Mg2+ ions. (c) 2013 Elsevier B.V. All rights reserved.
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