About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Local Ordering in Materials and Its Impacts on Mechanical Behaviors, Radiation Damage, and Corrosion
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Presentation Title |
Impact of Chemical Ordering on Sluggish Diffusion in Medium Entropy Alloys |
Author(s) |
Shigenobu Ogata |
On-Site Speaker (Planned) |
Shigenobu Ogata |
Abstract Scope |
Multi-principal element alloys, including medium-entropy alloys (MEAs), have excellent radiation resistance of MEAs enables them to serve for a long time in harsh environments such as high temperature, high pressure, and high irradiation. The excellent radiation resistance may be attributed to the sluggish diffusion in the MEAs. In this study, we quantitatively reproduced the chemical order in medium-entropy alloys at different annealing temperatures and annealing times using a newly developed high-precision machine-learning potential and investigated in detail the effects of chemical ordering on the vacancy and interstitial atomic diffusion as well as surface atom diffusion. The results show that the chemical order structure in bulk and at the surface effectively limits the diffusion path by introducing an extra energy penalty, resulting in sluggish diffusion. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Computational Materials Science & Engineering, Nuclear Materials |