About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Local Chemical Ordering and Its Impact on Mechanical Behaviors, Radiation Damage, and Corrosion
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| Presentation Title |
Controlling Short-Range Ordering in Nanocrystalline High-Entropy Alloys Through Grain Boundary Segregation |
| Author(s) |
Moses Awenbiik Adaan-Nyiak, Ahmed A. Tiamiyu |
| On-Site Speaker (Planned) |
Moses Awenbiik Adaan-Nyiak |
| Abstract Scope |
High-entropy alloys (HEAs) have gained attention due to their promising mechanical and functional properties. While typically regarded as random solid-solutions, emerging research revealed that HEAs can develop short-range ordering (SRO), owing to the complex interactions that exist between different atomic pairs. SROs can have detrimental effects on material performance, making it essential to have control over their evolution. This study employed techniques—high-energy synchrotron X-ray diffraction/pair distribution function, transmission electron microscopy, and atom probe tomography to investigate SRO in a model grain boundary (GB)-decorated nanocrystalline (NC) (AlCoCrFe)100-xZrx. The findings reveal that GB segregation of Cr, Fe, and Zr in annealed NC-AlCoCrFe and -(AlCoCrFe)98.5Zr1.5 stabilizes lattice constants and suppress SRO. The short diffusion paths due to high GB density and higher energy state of GBs promote GB segregation at the expense of SRO formation. Warren-Cowley coefficient calculations further confirm the absence of SRO in the NC-HEA systems. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Characterization, Nanotechnology |