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Neutron Diffraction Study of Ferroelasticity in a 3 mol% Y 2 O 3 –ZrO 2
Author(s) -
Ma Yuxiang,
Kisi Erich H.,
Kennedy Shane J.
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb00668.x
Subject(s) - neutron diffraction , ferroelasticity , materials science , tetragonal crystal system , diffraction , plasticity , creep , neutron , lattice constant , crystallography , composite material , mineralogy , crystal structure , ferroelectricity , chemistry , dielectric , optics , physics , optoelectronics , quantum mechanics
In situ neutron diffraction patterns were recorded from a 3Y‐TZP sample during a complete loading–unloading cycle at compressive loads up to 2.3 GPa. The macroscopic stress–strain diagram shows elastic behavior to 1.7 GPa followed by volume conserving plastic strains of ∼1.6 × 10 − 3 . There were no signs of t → m transformation in the neutron diffraction patterns, and intensity changes in the pattern show that the plasticity is due to ferroelastic switching of tetragonal zirconia crystals. Quantification of the degree of switching gives good agreement with the macroscopic strains. The ferroelastic switching is completely reversed by a process akin to creep relaxation on unloading. Lattice parameters, elastic constants, and structural changes as a function of load are also discussed.