Neutron diffraction study of ferroelasticity in a 3 mol% Y₂O₃-ZrO₂

Title: Neutron diffraction study of ferroelasticity in a 3 mol% Y₂O₃-ZrO₂
Creator: Ma, Yuxiang; Kisi, Erich H.; Kennedy, Shane J.
Relation: Journal of the American Ceramic Society Vol. 84, Issue 2, p. 399-405
Relation: http://www.blackwell-synergy.com/doi/abs/10.1111/j.1151-2916.2001.tb00668.x
Publisher: Blackwell Publishing Ltd.
Resource Type: journal article
Date: 2001
Description: 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.
Subject: ferroelastic materials; yttria; zirconia
Identifier: uon:1328
Identifier: http://hdl.handle.net/1959.13/27059
Identifier: ISSN:0002-7820
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