| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
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Local Chemical Ordering and Its Impact on Mechanical Behaviors, Radiation Damage, and Corrosion
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| Presentation Title |
Impacts on Microstructure and Mechanical Properties due to Chemical Short-Range Order in CoCrNi and CrNi2 Alloys |
| Author(s) |
Vinicius Bacurau, Pedro Moreira, Daniel Miracle, Angelo Andreoli, Eric Mazzer, Michael Widom, Michael Kaufman, Yifan Cao, Rodrigo Freitas, Francisco Gil Coury |
| On-Site Speaker (Planned) |
Francisco Gil Coury |
| Abstract Scope |
Chemical Short-Range Order (CSRO) in high and medium entropy alloys (HEAs/MEAs) has been a main point of intense debate due to its ambiguous impact on material properties. This study presents a comprehensive analysis of CSRO in CoCrNi and CrNi2 alloys, utilizing calorimetric data and atomistic simulations to confirm and quantify the presence of CSRO. The proposed methodology facilitates precise identification of local ordering in CoCrNi and CrNi2 alloys, revealing mechanisms of CSRO formation and destruction based on thermal evolution. Samples of CoCrNi (Co33Cr33Ni33) and CrNi2 (Cr33Ni66) were fabricated in various ordered states and extensively characterized via synchrotron X-ray diffraction, X-ray absorption spectroscopy, and transmission electron microscopy. Despite inducing varied levels of CSRO in CoCrNi, no significant alterations in overall mechanical behavior were observed. However, the CrNi2 alloy, which undergoes long-range ordering, exhibited substantial changes in yield strength, ultimate tensile stress, dislocation density, and ductility. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Characterization |