About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
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Advances in Multi-Principal Element Alloys V: Mechanical Behavior
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| Presentation Title |
Grain size dependence of competing deformation mechanisms in a CrCoNi medium entropy alloy |
| Author(s) |
Xun-Li Wang, Li Zhu, Guangya Li, Weixia Dong |
| On-Site Speaker (Planned) |
Xun-Li Wang |
| Abstract Scope |
Deformation behaviors of CrCoNi MEA with different grain sizes were investigated by in-situ neutron diffraction and TEM. For coarse-grained CrCoNi, the initial plastic deformation was driven by dislocation slip, while stacking faults and twinning became activated at a later stage. The critical stress for stacking faults exhibited a weaker grain size sensitivity than that of dislocation slip. As a result, below a grain size threshold, the critical stress needed to trigger the dislocation slip caught up with that of stacking faults. It is shown that when the grain size was below ~1.5 μm, all three deformation modes, namely, dislocation slip, stacking faults, and twinning, were activated simultaneously. The contributions from dislocations and planar faults to the work hardening were quantified, which revealed a dominant role of dislocations in the hardening behaviors of the CrCoNi alloy. Finally, recent results on nanocrystalline CoNi alloy will also be presented. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Characterization, Mechanical Properties |