About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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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 |
Won’t You Be My Neighbor: Tracking Chemical Short-Range Order and Its Impact on Corrosion Resistance in a Medium Entropy Alloy |
Author(s) |
Elaf A. Anber, Debashish Sur , John Scully, Mitra Taheri |
On-Site Speaker (Planned) |
Elaf A. Anber |
Abstract Scope |
High entropy alloys have received considerable attention due to their unique properties, many of which have been attributed to the existence of the local chemical short-range order (CSRO) which plays a critical role in percolation processes, and diffusion, ultimately affecting both passivation and high temperature oxidation of HEAs. While theory predicts SRO, it is much more difficult to detect experimentally. Here, we utilized EXAFS to examine the evolution of local SRO in as homogenized and aged CoCrNi system and directly connected to the passivation. Our results revealed that ordered CSRO exists in the as-homogenized alloy. Interestingly, the corrosion results revealed direct impact on aqueous passivation properties with aged CoCrNi MEA with Cr-Cr clustering showing better performance in harsh 0.1 M H2SO4 solution containing 3 M NaCl with lesser dissolved monolayers required to passive film formation and lower passive current densities. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Characterization, High-Temperature Materials |