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Environment and time dependent hardness in zirconia

Published online by Cambridge University Press:  03 March 2011

A.S. Pereira  and
J.A.H. da Jornada
A.S. Pereira
Affiliation:
Instituto de Fisica, Universidade Federal do Rio Grande do Sul, 91500-Porto Alegre-RS, Brasil
J.A.H. da Jornada
Affiliation:
Instituto de Fisica, Universidade Federal do Rio Grande do Sul, 91500-Porto Alegre-RS, Brasil
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Abstract

The microhardness of monoclinic ZrO2 single-crystals was measured in different environments: air, water, and toluene. An indentation creep process at room temperature was observed for the measurements in moist media pointing for a water-activated plastic relaxation mechanism. This effect is discussed employing the models previously proposed to explain similar behaviors in ZrO2 and other nonmetallic materials. A possible correlation with the conditions for the nucleation in phase transitions is proposed.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 9 , Issue 5 , May 1994 , pp. 1059 - 1062
Copyright
Copyright © Materials Research Society 1994

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References

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