Abstract
The slow growth characteristics of indentation-induced microcracks in phase-separated glasses with participate microstructure were investigated. The samples chosen for study were lead borate glasses whose compositions lie in the immiscible region of the PbO-B 2 O 3 system. Vickers indentations were made on the polished surface of the glass specimens in air at room temperature. The extension of induced median/radial crack under residual stress field was monitored by optical microscopy over a time after unloading. Experimental results were interpreted in terms of the properties and amounts of the constituent phases and crack-particle interaction mechanisms.
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