About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
Presentation Title |
K-6: Characterizing the Influence of Microstructure on Twin Nucleation in Ferroelastic Ceramics |
Author(s) |
Charles S. Smith, Jessica Krogstad |
On-Site Speaker (Planned) |
Charles S. Smith |
Abstract Scope |
Ferroelastic deformation is known to lead to increased toughness in many electroceramic and structural ceramic materials through the nucleation and motion of twins. However, the effect that local microstructure has on ferroelastic twin nucleation is not yet understood. Here, the influence of microstructural variables including grain size and crystal orientation on the probability of twin nucleation has been examined. Polycrystalline ceramics have been deformed using microindentation to evaluate the frequency and distribution of twin nucleation in differently sized grains. Additionally, in situ scanning and transmission electron microscopy with micropillar and nanopillar compression has been used to measure the stress associated with twin nucleation for single crystals of varying size and crystallographic orientation. High probability of twin nucleation was found to correlate to increased grain size, and twinning was suppressed in grains and single crystals as size decreased. These results may be used in the informed design of tough ceramic microstructures. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |