| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
| Presentation Title |
Cores of 1/2<110>-type Dislocations in the CrMnFeCoNi High-entropy Alloy Investigated by STEM, the Center of Symmetry and the Nye Tensor Mapping Techniques |
| Author(s) |
Milan Heczko, Veronika Mazánová, Roman Gröger, Tomáš Záležák, Mohammad S. Hooshmand, Easo P George, Michael J Mills, Antonín Dlouhý |
| On-Site Speaker (Planned) |
Milan Heczko |
| Abstract Scope |
The influence of small pre-strains on the elevated-temperature stability and microstructure of the equiatomic CrMnFeCoNi high-entropy alloy is investigated. Attention is given to whether any of the alloy elements segregate to individual dislocations. Samples were deformed in tension at room temperature to plastic strains of 0.2 and 2.3%, and subsequently annealed at 973 K for 800 hours. The pre-strains activated planar slip of 1/2<110>-type dislocations on {111}-type glide planes. Interactions of this planar slip with special Σ3 grain boundaries formed a number of dislocation segments with a <110>-type crystallographic orientation suitable for a credible end-on analysis. Results of atomic resolution STEM and Super-X EDS experiments combined with the center of symmetry and the Nye-tensor mapping suggest that the indicated thermo-mechanical treatments did not cause any chemical changes to dislocation cores. Important implications of presented results on the mechanisms of high-temperature creep in this class of materials are discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Characterization, Modeling and Simulation |