| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Elements Alloys X: Alloy Development and Properties
|
| Presentation Title |
Strengthening Mechanisms and Deformation Behaviors in Single BCC Phase Refractory High-entropy Alloys |
| Author(s) |
Chanho Lee, George Kim, Yi Chou, Michael C Gao, Ke An, Gian Song, Yi-Chia Chou, Wei Chen, Nan Li, Saryu J Fensin, Peter K. Liaw |
| On-Site Speaker (Planned) |
Chanho Lee |
| Abstract Scope |
Single-phase solid-solution refractory high-entropy-alloys (RHEAs) show remarkable mechanical properties, such as high yield strength with significant softening resistance at elevated temperatures. Hence, the in-depth study of the deformation behaviors for body-centered-cubic (BCC) RHEAs is a critical issue to explore the uncovered/unique deformation and strengthening mechanisms. We have investigated the elastic- and plastic-deformation behaviors of a single BCC NbTaTiV and NbTaTiVZr RHEAs, using integrated experimental efforts and theoretical calculations. The in-situ neutron-diffraction results reveal a transition of the elastic-deformation feature from isotropic to anisotropic modes at elevated temperatures. Furthermore, we have systematically and quantitatively determined lattice distortion using a theoretical model, first-principles calculations, synchrotron X-ray/neutron diffraction, and scanning-transmission-electron microscopy techniques. These results demonstrate that severe lattice distortion is a core factor for developing high strengths in RHEAs. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, High-Temperature Materials, Mechanical Properties |