About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Local Chemical Ordering and Its Impact on Mechanical Behaviors, Radiation Damage, and Corrosion
|
| Presentation Title |
Substantial Increase in Fracture Energy of Co30Cr40Ni30 Alloy: Role of Chemical Short-Range Order? |
| Author(s) |
Angelo Fernandes Andreoli, Francisco Gil Coury |
| On-Site Speaker (Planned) |
Angelo Fernandes Andreoli |
| Abstract Scope |
The influence of chemical short-range order (CSRO) on the mechanical behavior of multi-principal element alloys (MPEAs) remains debated. Although increasing Co and Cr concentrations in CoCrNi-based alloys is known to reduce stacking fault energy (SFE) and promote fcc-to-hcp martensitic transformation, CSRO’s role in these phenomena is unclear. In this study, we induced CSRO by aging recrystallized Co30Cr40Ni30 samples at 475 °C for 240 hours. Differential scanning calorimetry (DSC) was used to evaluate enthalpy of formation in both recrystallized and aged states. Charpy V-notch impact tests at room and liquid nitrogen temperatures assessed mechanical behavior. Aging led to a 26 % increase in absorbed fracture energy at room temperature, suggesting a CSRO effect on high strain rate mechanical performance. Post-fracture analysis highlights the contributions of twinning-induced plasticity (TWIP) and transformation-induced plasticity (TRIP), shedding light on the interplay between CSRO, SFE, nanotwinning, and martensitic transformation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Phase Transformations |