| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
100 Years and Still Cracking: A Griffith Fracture Symposium
|
| Presentation Title |
Transformation-induced Cracking in ZrO2 Shape-memory Ceramics: towards Cyclic Stability in Polycrystals |
| Author(s) |
Edward L. Pang, Isabel R. Crystal, Christopher A. Schuh |
| On-Site Speaker (Planned) |
Edward L. Pang |
| Abstract Scope |
A new class of shape memory materials has been proposed based on ZrO2-based ceramics, which offer higher martensitic transformation stresses, work output, transformation temperatures, and possibly environmental resistance compared to metallic shape-memory alloys. Despite these potential benefits, shape memory ceramics (SMCs) have not yet lived up to their potential because they are limited by catastrophic cracking during the martensitic transformation. Recent work in the group has focused on characterizing and understanding transformation-induced cracking in bulk specimens. In this talk, we will present recent results evaluating the effect of grain structure on crack evolution during thermal cycling of single- and poly-crystalline bulk specimens. We will also overview our recent efforts to suppress transformation cracking by compositional tuning to minimize mismatch stresses in polycrystals. Together, these studies aid our understanding of transformation-induced cracking and pave the way towards repeatable shape memory and superelastic behavior in polycrystalline SMCs. |
| Proceedings Inclusion? |
Planned: |