About this Abstract |
Meeting |
2026 TMS Annual Meeting & Exhibition
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Symposium
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Ultrafine-Grained and Heterostructured Materials (UFGH) XIV
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Presentation Title |
Diffusion in ECAP-processed CoCrFeMnNi high-entropy alloy |
Author(s) |
Nuri Choi, Lydia Daum, Yao Jiang, Jing Tao Wang, Gerhard Wilde, Sergii V. Divinskyi |
On-Site Speaker (Planned) |
Sergii V. Divinskyi |
Abstract Scope |
The impact of chemical complexity achieved by high-entropy alloy concept is investigated. An equiatomic CoCrFeMnNi high-entropy alloy is subjected to ECAP processing at room temperature. The nanocrystalline microstructure and its evolution during the subsequent heat treatments are examined in combination with GB diffusion measurements. The existence of two distinct short-circuit diffusion paths aka two families of non-equilibrium GBs, alongside to the deformation-induced open-porosity channels, is discovered. It is proposed that the segregated (dominantly by Mn and Ni) and segregation-free boundaries reveal the distinct diffusion properties, with the deformation-modified state of the segregation-free interfaces showing a faster relaxation. The results are discussed with respect to ECAP-processed pure Ni, BC2-processed CoCrFeMnNi and additively manufactured CoCrFeMnNi high-entropy alloy, all of which reveal the existence of the “non-equilibrium” GBs. The influence of chemical complexity and processing route on the “non-equilibrium” state of GBS and its relaxation is analyzed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, High-Entropy Alloys, |