About this Abstract |
Meeting |
2023 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 |
Local and Short-range Chemical Order in High/Medium Entropy Alloys |
Author(s) |
Evan Ma |
On-Site Speaker (Planned) |
Evan Ma |
Abstract Scope |
Among the local chemical order (LCO) that can develop in H/MEAs, chemical short-range order (CSRO) is arguably the most difficult to decipher, because its convincing identification demands not only irrefutable diffraction evidence, but also intricate chemical information on sub-nanometer length scale regarding the different preferences of the constituent species to occupy certain lattice planes/sites in the first and second nearest-neighbor atomic shell(s). Here we discover that under an appropriate zone axis, micro/nano beam diffraction, atomic-resolution imaging and chemical mapping in transmission electron microscope can reveal CSRO in face-centered-cubic VCoNi and CrCoNi MEAs, including its spatial extent, atomic packing configuration and preferential lattice occupancy by the species. Atomic strain mapping demonstrates the interactions of the CSROs with dislocations. See X. Chen et al., Nature 592 (2021) 712-716, and L. Zhou et al., Acta Mater. 224 (2022) 117490. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Characterization, Mechanical Properties |