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Microprobe fluorescence spectroscopy evaluation of stress fields developed along a propagating crack in an Al2O3/CaO 6Al2O3ceramic composite

Published online by Cambridge University Press:  31 January 2011

O. Sbaizero ,
S. Maschio ,
G. Pezzotti  and
I. J. Davies
O. Sbaizero
Affiliation:
Dipartimento di Ingegneria dei Materiali, University of Trieste, Via Valerio 2, 34127, Italy
S. Maschio
Affiliation:
Dipartimento di Scienze e Tecnologie Chimiche, University of Udine, Via del Cotonificio 108, 33100 Italy
G. Pezzotti*
Affiliation:
Ceramic Physics Laboratory, Department of Materials, Kyoto Institute of Technology, Matsugasaki, Sakyo-Ku, Kyoto 606–8585, Japan
I. J. Davies
Affiliation:
Advanced Fibro-Science, Kyoto Institute of Technology, Matsugasaki, Sakyo-Ku, Kyoto 606-8585, Japan
*
a)Address all correspondence to this author.[email protected]
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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.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 10 , October 2001 , pp. 2798 - 2804
Copyright
Copyright © Materials Research Society 2001

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