| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Local Chemical Ordering and Its Impact on Mechanical Behaviors, Radiation Damage, and Corrosion
|
| Presentation Title |
Effect of local chemical order on vacancy diffusion in NiCoCr medium entropy alloys |
| Author(s) |
Eryang Lu, Xiaoyu Gui, Xudong An, Filip Tuomisto |
| On-Site Speaker (Planned) |
Eryang Lu |
| Abstract Scope |
Multi-principal-element alloys (MPEAs) have attracted attention as a new class of metallic materials with excellent mechanical properties and other superior characteristics. The mobility and energy barriers of point-like defects are related to the local chemical fluctuation, thus ensuring the mechanical stability and irradiation resistance of the materials. Previous researches have verified the existence of local chemical order (LCO) structure in MPEAs, which play a significant role in tuning defect motion properties. In this work, we introduce point-like lattice defects in equi-atomic NiCoCr alloys by particle irradiation under cryogenic temperature (40 K). This investigation delves into the characterization of irradiation-induced vacancy diffusion, with a specific focus on elucidating their diffusion kinetics through positron annihilation spectroscopy. Furthermore, employing both simulations and experimental analyses, we explicate the influence and mechanism of local chemical order on the behavior of defects. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Composites, High-Entropy Alloys |