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Phys. Rev. B 68, 134106 (2003) [10 pages]

Nonhydrostatic stabilization of an orthorhombic phase of zirconia

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Giuseppe Fadda1,*, Lev Truskinovsky2,1,†, and Giovanni Zanzotto3,‡
1Department of Aerospace Engineering and Mechanics, University of Minnesota, 110 Union St. SE, Minneapolis, Minnesota 55455, USA
2Laboratoire de Mécanique des Solides, CNRS-UMR 7649, Ecole Polytechnique, 91128 Palaiseau, France
3Dipartimento di Metodi e Modelli Matematici per le Scienze Applicate (DMMMSA), Università di Padova, Via Belzoni 7, 35131 Padova, Italy

Received 22 April 2003; published 8 October 2003

An explicit polynomial strain-energy function for tetragonal-orthorhombic-monoclinic zirconia (ZrO2), calibrated from the conventional hydrostatic p-T phase diagram, is used to study the effects of nonhydrostatic loading on the phase equilibria in this material. Several representative sections of the phase diagram of ZrO2 in temperature and stress space, containing both triple and critical points, are computed. A new orthorhombic structure of ZrO2 is predicted to be the most stable phase for a variety of experimentally accessible shear loads, in a wide range of temperatures and pressures.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.68.134106
DOI:
10.1103/PhysRevB.68.134106
PACS:
61.50.Ks, 62.20.-x, 81.30.Kf

*Electronic address: fadda@aem.umn.edu

†Electronic address: trusk@lms.polytechnique.fr

‡Electronic address: zanzotto@dmsa.unipd.it

 
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