| About this Abstract |
| Meeting |
TMS Specialty Congress 2024
|
| Symposium
|
Accelerating Discovery for Mechanical Behavior of Materials 2024
|
| Presentation Title |
Uncovering Superelastic Energy Dissipation in Monazite Ceramics via Elevated Temperature Nanoindentation |
| Author(s) |
Henry Q. Afful, Corinne E. Packard |
| On-Site Speaker (Planned) |
Henry Q. Afful |
| Abstract Scope |
Energy damping based on phase transformation or point defect mechanisms has an extremely limited operating temperature range. For elevated temperature mechanical damping, an alternative superelastic mechanism with a wide operating temperature range is desired. Certain refractory rare earth orthophosphate ceramics exhibit energy recovery under nanoindentation hardness testing, and a reversible deformation twinning mechanism has been proposed as the origin of this recovery. Here, we investigate this recovery mechanism in two monoclinic rare earth orthophosphates (monazites) using spherical nanoindentation as a sensitive probe of deformation behavior. Cyclic loading across a range of peak loads and temperatures reveals the presence and persistence of superelastic energy damping across monazite compositions. The observed monazite behavior is similar to the elastic twinning phenomenon observed in calcite. In contrast to calcite, the damping is largely insensitive to temperatures up to at least 400C due to the refractory nature of the rare earth orthophosphates. |
| Proceedings Inclusion? |
Definite: Other |