About this Abstract |
| Meeting |
TMS Specialty Congress 2026
|
| Symposium
|
4th World Congress on High Entropy Alloys (HEA 2026)
|
| Presentation Title |
Influence of Chemical Short-Range Order on Stacking Fault Energy and Deformation in a CoCrNi-based Alloy |
| Author(s) |
Angelo Fernandes Andreoli, Gustavo Bertoli, Guilherme Stumpf, Vinícius Bacurau, Pedro Henrique Oliveira, David Silva, Francisco Coury |
| On-Site Speaker (Planned) |
Angelo Fernandes Andreoli |
| Abstract Scope |
Chemical short-range order (CSRO) has emerged as an intrinsic feature of complex concentrated alloys (CCAs), yet its influence on mechanical behavior remains unclear. Although simulations consistently predict that CSRO increases the stacking fault energy (SFE), experimental validation has been lacking. Here, we provide the first direct evidence that CSRO raises the SFE and suppresses the deformation-induced fcc-hcp transformation in a Co₃₀Cr₄₀Ni₃₀ alloy. Recrystallized and aged conditions were designed to produce minimal and pronounced CSRO states. Differential scanning calorimetry enabled quantification of CSRO-related enthalpy changes. Microstructural analysis confirmed equivalent grain structures and phase compositions in both states. Tensile tests at 300 K and 173 K showed that the recrystallized condition exhibits a clear TRIP-assisted transformation, whereas CSRO-rich samples display partial suppression of hcp martensite. Combined with DFT, Monte Carlo, and molecular dynamics simulations, these results demonstrate that CSRO critically governs deformation mechanisms in CCAs. |
| Proceedings Inclusion? |
Undecided |