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The Temperature Dependence of Yield Stress and Fracture Toughness in Unstabilized Zirconia Crystals

Published online by Cambridge University Press:  25 February 2011

T. W. Coyle ,
R. P. Ingel  and
P. A. Willging
T. W. Coyle
Affiliation:
Ceramics Division, National Bureau of Standards, Gaithersburg, MD 20899
R. P. Ingel
Affiliation:
Ceramics Branch, U.S. Naval Research Laboratory, Washington, DC 20375
P. A. Willging
Affiliation:
Ceramics Branch, U.S. Naval Research Laboratory, Washington, DC 20375
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Abstract

The flexural strength and the single edge notch beam fracture toughness of undoped ZrO2 crystals, grown by the skull melting technique, were examined from room temperature to 1400°C. On heating the toughness increased with test temperature to a maximum of 4.0 MPajm at 1225°C then gradually decreased to 2.6 MPa/m. Upon cooling after a 20 minute hold at 1250°C an increase in toughness to 5 MPa/m was observed at 1200°C; upon cooling to lower temperatures Kic gradually diminished. The loaddeflection curves for the flexural strength tests showed marked nonlinearity before failure for samples tested on cooling. The temperature dependence of the apparent yield stress suggests that initial yielding occurs by slip above 1200°C but that from 1200°C to 1050°C the observed yielding is due to stress induced tetragonal to monoclinic transformation.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 78: Symposium E – Advances in Structural Ceramics , 1986 , 89
Copyright
Copyright © Materials Research Society 1987

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References

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