Title

Shape Memory Effect and Pseudoelasticity Behavior in Tetragonal Zirconia Polycrystals: A Phase Field Study

Abstract

Martensitic tetragonal-to-monoclinic transformation in zirconia is a "double-edged sword", enabling transformation toughening or shape memory effects in favorable cases, but also cracks and phase degradation in undesirable scenarios. In stressed polycrystals, the transformation can burst from grain to grain, enabling stress field shielding and toughening in an autocatalysis fashion. This transformation strain can be recovered by an adequate thermal cycle at low temperatures (when monoclinic is stable) to provide a shape memory effect, or by unloading at higher temperatures (when tetragonal is stable) to provide pseudoelasticity. We capture the details of these processes by mining the associated microstructural evolutions through the phase field method. The model is both stress and temperature dependent, and incorporates inhomogeneous and anisotropic elasticity. Results of simulations show an ability to capture the effects of both forward (T → M) and reverse (M → T) transformation under certain boundary conditions.

Department(s)

Materials Science and Engineering

Research Center/Lab(s)

Center for High Performance Computing Research

Keywords and Phrases

Elasticity; Martensitic transformations; Polycrystals; Shape memory effect; Unloading; Anisotropic elasticity; Phase field models; Pseudoelasticity; Temperature dependent; Tetragonal zirconia polycrystal; Tetragonal-to-monoclinic transformation; Transformation strain; Transformation toughening; Zirconia

International Standard Serial Number (ISSN)

07496419

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2014 Elsevier Ltd, All rights reserved.

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