| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys II
|
| Presentation Title |
Structure-induced Local Lattice Distortions in a Refractory High-entropy Alloy |
| Author(s) |
Jian Min J. Zuo, Haw-Wen Hsiao |
| On-Site Speaker (Planned) |
Jian Min J. Zuo |
| Abstract Scope |
The phase stability of group IV elements (Ti, Zr, and Hf) containing alloys depends sensitively on composition, temperature, and pressure. This sensitivity has been taken to great advantages in tuning a wide variety of properties in titanium alloys to suit applications. Here, using advanced transmission electron microscopy, we examine the interplay between the nanoscale compositional fluctuations and locally varying bcc dynamical instabilities and the formation of structure-induced local lattice distortions at low temperatures, which together with possible chemical short-range ordering (CSRO), are possibly behind the strength and ductility observed in some of refractory high entropy alloys (RHEAs) and brittleness in others. The RHEA we examine here is TaNbHfZrTi. Using scanning electron nanodiffraction, we examine the fluctuations in electron diffuse scattering and determine local lattice distortions. The results reveal characteristic distortional patterns that suggest structural instabilities commonly observed in Ti alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Phase Transformations, Other |