Neutron diffraction observations of ferroelastic domain switching and tetragonal-to-monoclinic transformation in Ce-TZP

Journal Article · Sat Mar 01 04:00:00 EST 1997 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1997.tb02877.x· OSTI ID:474143

Kisi, E H ^[1]; Kennedy, S J; Howard, C J ^[2]

---

1. Univ. of Newcastle, Callaghan, New South Wales (Australia). Dept. of Mechanical Engineering
2. Australian Nuclear Science and Technology Organisation, Menai, New South Wales (Australia). Neutron Scattering Group

In-situ neutron diffraction has been used to study the plastic deformation of a tetragonal zirconia polycrystal stabilized with 12 mol% ceria under compressive loads up to 1.6 GPa. The development of significant plastic strain in the ceramic has been found to be due to a combination of ferroelastic switching and the tetragonal-to-monoclinic phase transformation, both beginning at {approximately}1.2 GPa. Evidence of a strong coupling between the two phenomena is present. Both transitions are partially reversed on removal of the load. The linear elastic response of the a and c crystal axes of the parent tetragonal phase suggests that the ferroelastic switching occurs directly by a shear mechanism rather than via a cubic intermediate state. Anisotropic distortion of the tetragonal unit cell, as the critical stress is approached, gives some insight into the shear transformation mechanisms.

• Sponsoring Organization: Australian Research Council, Canberra, ACT (Australia)
• OSTI ID: 474143
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 3 Vol. 80; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
CERIUM OXIDES
DOMAIN STRUCTURE
MONOCLINIC LATTICES
PHASE TRANSFORMATIONS
PLASTICITY
STRAINS
STRESSES
TETRAGONAL LATTICES
ZIRCONIUM OXIDES