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Strength and Toughness of MG-PSZ and Y-TZP Materials at Cyrogenic Temperatures

Published online by Cambridge University Press:  25 February 2011

S. Veitch ,
M. Marmach  and
M. V. Swain
S. Veitch
Affiliation:
Nilcra Ceramics Pty. Ltd., Northcote, Victoria
M. Marmach
Affiliation:
Nilcra Ceramics Pty. Ltd., Northcote, Victoria
M. V. Swain
Affiliation:
CSIRO Division of Materials Science, Clayton, Victoria 3168 Australia
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Abstract

The influence of temperature between R.T. and liquid nitrogen (−196°C) on the strength and toughness of three grades of Mg-PSZ and a 3 mol% Y-TZP material have been investigated. The toughness of the Mg-PSZ materials passes through a maximum at the Ms temperature, whereas the strength increases monotonically with decreasing temperature regardless of Ms. The Y-TZP material exhibits increasing toughness with decreasing temperature but the strength passes through a maximum at -80°C. The results are discussed in terms of transformation and R-curve limited strength of transformation toughened ceramics. For Mg-PSZ materials it is suggested that the critical stress to initiate a non reversible transformation on the tensile surface is responsible for microcracking and ensueing R-curve development.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 78: Symposium E – Advances in Structural Ceramics , 1986 , 97
Copyright
Copyright © Materials Research Society 1987

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References

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