About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys V: Mechanical Behavior
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| Presentation Title |
Hierarchical texture with consecutive onset of deformation twinning in CoCrFeMnNi high-entropy alloy |
| Author(s) |
Jungwan Lee, Hyoung Seop Kim |
| On-Site Speaker (Planned) |
Jungwan Lee |
| Abstract Scope |
Hierarchical structuring alters mechanical performances and physical characteristics of metals regarding grain, phase, texture, and dislocation density. Two groups of grains were engendered by different recrystallization mechanisms in a single material: dynamic and static recrystallization. During hot rolling at 825 ℃, ~63% grains were dynamically recrystallized with γ-fiber. Thereafter, annealing at 800 ℃ for 5 minutes led to static recrystallization in unrecrystallized region, forming random orientations aside from the dynamically recrystallized grains. Under tensile deformation at –196 ℃ for equimolar CoCrFeMnNi with texture hierarchy, deformation twinning preferentially occurs in γ-fiber texture with relatively higher strain energy, comprising dynamically recrystallized grains formed by hot rolling deformation. Interestingly, randomly oriented grains gradually turn into γ-fiber as tensile strain increases, where the onset of deformation twinning is observed at the late stage of deformation. The consecutive onset of twinning leads to enhanced uniform elongation, leading to top-notch tensile properties thanks to texture hierarchy. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Process Technology |