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The Stress Induced Transformation by Fracture in Y2 O3 Containing Tetragonal Zirconia Polycrystals

Published online by Cambridge University Press:  25 February 2011

G. Katagiri ,
H. Ishida ,
A. Ishitani  and
T. Masaki
G. Katagiri
Affiliation:
Toray Research Center, IncOtsu, Shiga, 520 Japan
H. Ishida
Affiliation:
Toray Research Center, IncOtsu, Shiga, 520 Japan
A. Ishitani
Affiliation:
Toray Research Center, IncOtsu, Shiga, 520 Japan
T. Masaki
Affiliation:
Technical Development Department, Toray Industries, Inc., Otsu, shiga, 520 Japan
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Abstract

The stress induced transformation in Y2 O3 containing tetra gonal zirconia polycrystals (Y-TZP) by a three-point bending test was studied by Raman microprobe. Transformation zone extends to as large as 100μm in the starting side of the fracture and the transformation zone size becomes smaller in the direction from the starting to the ending side of the fracture. The transformation zone size has no correlation with fracture toughness and Y2O3 content. It is suggested that the transformation plastici y may operate in the initial stage of the fracture. The obtained results have remarkable contrast with the case of the fracture of a pre-indented specimen. The transformation behavior of defect-dominating fracture is also discussed.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 78: Symposium E – Advances in Structural Ceramics , 1986 , 43
Copyright
Copyright © Materials Research Society 1987

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References

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