Effect of lithium-to-magnesium ratio in metaphosphate glasses on crack-tip condensation and sub-critical crack growth
Effect of lithium-to-magnesium ratio in metaphosphate glasses on crack-tip condensation and sub-critical crack growth
复制标题
偏磷酸盐玻璃中锂镁比对裂纹尖端凝聚和亚临界裂纹扩展的影响
DOI:
10.1016/j.jnoncrysol.2013.04.063
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发表时间:
2013
影响因子:
3.5
通讯作者:
J. Deubener
中科院分区:
文献类型:
--
作者:
S. Striepe;J. Deubener
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 240h. Distinct condensation of water at the crack-tip up to 30μm 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.
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