About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Phase Transformations in Ceramics: Science and Applications
|
Presentation Title |
Electrical Activation of the Martensitic Transformation in Zirconia |
Author(s) |
Christopher A. Schuh, Alan Lai |
On-Site Speaker (Planned) |
Christopher A. Schuh |
Abstract Scope |
The martensitic transformation in zirconia has been extensively studied for its role in transformation toughening, shape memory, and superelasticity. This talk will review our recent work exploring the coupling of electric field with this transformation. Although both phases (tetragonal and monoclinic) are centrosymmetric and therefore not intrinsically electrically polarized, they are both polarizable under field with significantly different electrical susceptibilities. As a result, when a field is applied in the monoclinic (low temperature) phase, there is an electrical driving force that favors the transition to the tetragonal (high temperature) phase. We establish this unique activation mode for martensitic transformation through in-situ x-ray diffraction experiments on bulk single crystal specimens, and verify its reversibility and reproducibility. Clausius-Clapeyron analysis is used to develop the form of the phase diagram, which features a transus temperature that is parabolic with respect to electric field. This unusual scaling and its corollary implications are also discussed. |