About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Advances in Refractory High Entropy Alloys and Ceramics
|
| Presentation Title |
A Nanoindentation Study of Incipient Plasticity in Refractory High-Entropy Alloys |
| Author(s) |
Arezoo Zare, Matin Jafari, Tamanna Zakia, Mingwei Zhang |
| On-Site Speaker (Planned) |
Arezoo Zare |
| Abstract Scope |
The incipient plasticity of body-centered cubic refractory high-entropy alloys NbTaTiHf and NbTaTiV was investigated via nanoindentation, with a focus on the first pop-in event. Polycrystalline samples exhibited clear displacement bursts in the load-displacement curves, corresponding to the onset of dislocation nucleation. Using a statistical model, both the activation volume and nucleation rate were determined. The activation volume for both alloys was consistently found to be smaller than one atomic volume, indicating that the onset of plasticity is governed by a highly localized process, consistent with single-atom migration. |