| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale V
|
| Presentation Title |
Superelasticity and Superplasticity in Shape Memory Ceramic Nanoparticles |
| Author(s) |
Ning Zhang, Mohsen Asle Zaeem |
| On-Site Speaker (Planned) |
Ning Zhang |
| Abstract Scope |
Martensitic phase transformation in zirconia-based ceramics has attracted considerable attention due to its associated shape memory effect. However, degradation of superelastic and shape memory properties is observed experimentally only after a few loading cycles. By means of molecular dynamics technique, this work aims to reveal the nanoscale responsible plastic deformation mechanisms in yttria stabilized tetragonal zirconia (YSTZ) nanoparticles under compression. Simulation results show that up to 7.8% superelastic strain and 13.8% superplastic strain are achieved in single crystal particles. By heating to ~600 K, the deformed particle is observed to regain its original shape. However, with the increase of loading-unloading-heating cycles the required temperature for completely shape recovery increases, up to ~1300 K. Even more, 1%-3% residual strains are left after several cycles. Although self-healing is observed, amorphous phase accumulation in the phase transformation region is observed to be responsible for the degradation of shape memory property in YSTZ nanoparticles. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |