| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys II
|
| Presentation Title |
Chemical Short-range Order in Multi-principal Element Alloys |
| Author(s) |
Takeshi Egami |
| On-Site Speaker (Planned) |
Takeshi Egami |
| Abstract Scope |
Multi-principal element alloys (MPAs) are single-phase solid-solutions. But elements are not randomly distributed, forming chemical short-range order (CSRO) which affects various properties including mechanical strength. CSRO is driven mainly by charge-transfer among elements. It is not easy to observe the CSRO because usually constituent elements are close to each other in the atomic number, and their x-ray contrasts are weak. We use x-ray resonance to enhance the x-ray contrast to observe the CSRO. Near the x-ray absorption edge of the element the scattering factor depends strongly on the energy of the incident x-ray due to the x-ray resonance with the core states, providing the information on the structure around a specific element through the variation of the scattering intensity with the energy of the incident x-ray. We show CRSO exists for MPAs of 3d elements, which depends on composition and thermal history. This work was supported by the NSF. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Characterization, Modeling and Simulation |