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Direct measurement of crack shielding in ceramics by the application of Raman microprobe spectroscopy

Published online by Cambridge University Press:  03 March 2011

Daniel J. Belnap ,
Jing-Fong Tsai  and
Dinesh K. Shetty
Daniel J. Belnap
Affiliation:
Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112
Jing-Fong Tsai
Affiliation:
Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112
Dinesh K. Shetty
Affiliation:
Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112
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Abstract

Raman microprobe spectroscopy was employed to measure stresses in ceria partially stabilized zirconia/alumina (Ce-TZP/Al2O3) composites toughened by transformation zone shielding. The near crack-tip stresses in in situ loaded compact specimens were measured by measuring stress-induced shifts in the frequency of a Raman peak corresponding to the tetragonal zirconia phase. The peak shift as a function of the applied stress was separately calibrated using a ball-on-ring flexure test. Both analytical function-fitting methods and numerical methods that determine centroids were evaluated for measuring the shift in the frequency with applied stress. A method based on locating the centroid of the intensity peak with a moving range of frequencies was selected because it gave the best correlation between the frequency shift and the applied stress. The stresses measured within an inner core of the transformation zone (∼30 μm), where the volume fraction of the transformed monoclinic phase was essentially constant, were used to estimate a local crack-tip stress intensity (Kl). The amount of total crack shielding (ΔKs) was then estimated from the applied stress intensity (Ka) and the estimated local crack-tip stress intensity. Comparisons with the predictions of two different theories of zone shielding indicated that transformation toughening models can account for 80 to 89% of the measured crack shielding, depending upon the value of the crack-tip stress intensity assumed in the models.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 12 , December 1994 , pp. 3183 - 3193
Copyright
Copyright © Materials Research Society 1994

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