| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
|
| Presentation Title |
Competition Between Faulting Plasticity and Transformation-Induced Plasticity at Cryogenic Temperatures |
| Author(s) |
Hrishikesh Deodhar, Je In Lee, Hyunseok Oh |
| On-Site Speaker (Planned) |
Hrishikesh Deodhar |
| Abstract Scope |
Transformation-induced plasticity (TRIP) and twinning-induced plasticity are known as major deformation mechanisms in face-centered cubic (fcc) alloys with low stacking-fault energies (SFEs). Recently, a new mechanism, faulting plasticity, has been proposed for fcc complex concentrated alloys (CCAs) with negative SFEs, which is mediated by stacking faults while suppressing the formation of bulky, brittle martensite, potentially benefiting mechanical properties. However, there is a possibility that TRIP might replace faulting plasticity at cryogenic temperatures due to the low SFE of these alloys, resulting in embrittlement. Here, we design Co-rich CCAs that exhibit faulting plasticity at room temperature and study the competition between faulting plasticity and TRIP during deformation at cryogenic temperatures, as well as its influence on impact toughness. The competition is affected by the levels of local chemical ordering (LCOs) induced by varied aging treatments and additional solute elements, which provides a guideline on realizing faulting plasticity for enhanced mechanical properties. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Phase Transformations |