The ferroelastic transformation in yttria- and ceria-stabilized tetragonal zirconia via neutron diffraction

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:225311

Cain, M G; Lewis, M H; Backshall, M ^[1]; Bennington, S M; Hull, S ^[2]

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1. Univ. of Warwick, Coventry (United Kingdom). Centre for Advanced Materials
2. Rutherford Appleton Labs., Didcot (United Kingdom)

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 stabilized TZP and (0.70 {+-} 0.05) GPa for ceria stabilized 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 mechanisms and hence toughen zirconia or ceramics containing dispersed zirconia.

• OSTI ID: 225311
• Report Number(s): CONF-941144--; ISBN 1-55899-278-2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
CERIUM OXIDES
CRYSTAL-PHASE TRANSFORMATIONS
EXPERIMENTAL DATA
FRACTURE PROPERTIES
NEUTRON DIFFRACTION
YTTRIUM OXIDES
ZIRCONIUM OXIDES