About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Late News Poster Session
|
| Presentation Title |
Deciphering the Role of Stacking Fault Energy on TWIP–TRIP Interplay in Ni-Rich High Entropy Alloy With Tailored Ti Content |
| Author(s) |
Sudhansu Maharana, Tapas Laha |
| On-Site Speaker (Planned) |
Sudhansu Maharana |
| Abstract Scope |
Twinning- or transformation-induced plasticity (TWIP/TRIP) plays a pivotal role in imparting outstanding ductility coupled with ultrahigh-strength in FCC high-entropy alloys (HEAs). However, the underlying mechanisms governing the prolific nucleation of deformation twins (DTs) and HCP phase-transformation in FCC HEAs, compared to conventional FCC metals/alloys, remain elusive. This study employed atomic-resolution transmission electron microscopy and molecular dynamics simulations to investigate the increasing fraction of nanoscale-DTs and formation of HCP nanolamellae with rising Ti content in Ni-rich HEAs. Simulations revealed that Ti-induced chemical inhomogeneity broadened and overlapped the energy barriers for stacking fault nucleation, HCP phase-transformation and twin-thickening, thereby facilitating the concurrent activation of multiple plasticity mechanisms. Transformation-mediated twinning was featured in higher Ti-containing HEAs, wherein FCC transforms to HCP, followed by reversion to FCCtwin via partial-dislocation slip, enhancing twin proliferation. These findings uncover the role of chemical complexity on localized stacking fault energy in tailoring TWIP/TRIP mechanisms towards designing high-performance HEAs. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
High-Entropy Alloys, Other, Powder Materials |