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首页> 外文期刊>Journal of Materials Research >Microprobe fluorescence spectroscopy evaluation of stress fields developed along a propagating crack in an Al_2O_3/CaO centre dot 6Al_2O_3 ceramic composite
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Microprobe fluorescence spectroscopy evaluation of stress fields developed along a propagating crack in an Al_2O_3/CaO centre dot 6Al_2O_3 ceramic composite

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摘要

The fracture behavior upon stable crack propagation in bending was investigated for a ceramic matrix composite comprising 15 vol percent of calcium hexaluminate (CaAl_(12)O_(19) or "CA6") in an Al_2O_3 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.

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