| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation-induced Manipulation of Defect Structures and Hierarchical Microstructures
|
| Presentation Title |
Dynamically Reversible Shear Transformations in a CrMnFeCoNi High-entropy Alloy |
| Author(s) |
Jian Wang, Kaisheng Ming, Shijian Zheng |
| On-Site Speaker (Planned) |
Jian Wang |
| Abstract Scope |
Shear transformation, such as twinning and martensitic phase transformation, is generally unidirectional under monotonic thermal or mechanical loading. By tailoring stacking fault energy (SFE) and taking advantage of low temperature deformation, we achieve the dynamically reversible shear transformations in CrMnFeCoNi high-entropy alloys (HEAs) under uniaxial tension at cryogenic temperature. Plastic deformation is accommodated by dislocation slips and shear transformation bands, such as {111} stacking faults (SFs), {111} nano-twins, fcc → hcp shear transformation bands, high-density {0001} SFs and {1"0" 1 ̅1} nano-twins. More intriguingly, hcp → fcc shear transformations are stimulated by deformation-induced local dissipative heating. The reversible fcc ↔ hcp shear transformations and both {1"0-1" 1} and {111} nano-twinning lead to dynamic nano-laminated dual-phase (NL-DP) structures, which advances the monotonic “dynamic Hall-Petch” effect in enhancing strength, strain-hardening ability, and ductility by dynamically tailoring the type and width of shear transformation bands. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Phase Transformations |