Microprobe fluorescence spectroscopy evaluation of stress fields developed along a propagating crack in an Al2O3/CaO 6Al2O3ceramic composite
- 1 October 2001
- journal article
- Published by Springer Nature in Journal of Materials Research
- Vol. 16 (10) , 2798-2804
Abstract
The fracture behavior upon stable crack propagation in bending was investigated for a ceramic matrix composite comprising 15 vol% of calcium hexaluminate (CaAl12O19 or “CA6”) in an Al2.O3 matrix and compared to the crack bridging stresses as measured by microprobe fluorescence spectroscopy. In addition, piezospectroscopy coefficients of -4.57 and -3.79 cm-1 GPa-1 were determined for the peaks located at 14488 and 14528 cm-1, respectively, for monolithic CA6. It was concluded that the macroscopic R-curve behavior of the composite could be predicted from microscopic bridging stress data and indicated microprobe fluorescence spectroscopy to be a significant experimental tool for the investigation of fracture micromechanisms in ceramic materials.Keywords
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