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The Ferroelastic Transformation in Yttria- and Ceria-Stabilised Tetragonal Zirconia Via Neutron Diffraction

Published online by Cambridge University Press:  22 February 2011

Markys G. Cain ,
Mike H. Lewis ,
Matthew Backshall ,
Stephen M. Bennington  and
Steve Hull
Markys G. Cain
Affiliation:
Centre for Advanced Materials, University of Warwick, Coventry CV4 7AL, UK
Mike H. Lewis
Affiliation:
Centre for Advanced Materials, University of Warwick, Coventry CV4 7AL, UK
Matthew Backshall
Affiliation:
Centre for Advanced Materials, University of Warwick, Coventry CV4 7AL, UK
Stephen M. Bennington
Affiliation:
Rutherford Appleton Laboratories, Chilton, Didcot, Oxon 0X11 0QX, UK
Steve Hull
Affiliation:
Rutherford Appleton Laboratories, Chilton, Didcot, Oxon 0X11 0QX, UK
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Abstract

Neutron diffraction studies of tetragonal zirconia polycrystals (TZP) subjected to a varying applied uniaxial stress indicates that a ferroelastic crystalline transformation occurs within the bulk of the material. The critical coercive stress was determined to be (1.65±0.03) GPa for yttria stabilised TZP and (0.70±0.05) GPa for ceria stabilised TZP. The results agree well with previous reports concerning the ferroelasticity of tetragonal zirconia, and provide direct evidence indicating that the anomalies observed using the first X-ray diffraction studies originate from the bulk of the ceramic and not solely from the surface. The preferred orientation observed in the tetragonal crystallites was measured as a function of applied uniaxial stress and interpreted via a resolved stress criterion. It is believed that the ferroelastic transformation can act as an energy absorbing mechanism and hence toughen zirconia or ceramics containing dispersed zirconia.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 376: Symposium BB – Neutron Scattering in Materials Science , 1994 , 615
Copyright
Copyright © Materials Research Society 1995

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References

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