| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Atomistic Simulations Linked to Experiments to Understand Mechanical Behavior: A MPMD Symposium in Honor of Professor Diana Farkas
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| Presentation Title |
Stability of High Energy Faults in Ni-Based Superalloys |
| Author(s) |
Valery V. Borovikov, Mikhail I. Mendelev, Timothy M. Smith, John W. Lawson |
| On-Site Speaker (Planned) |
Valery V. Borovikov |
| Abstract Scope |
High energy faults generated by lattice dislocations entering the strengthening precipitates of Ni-based superalloys are at the core of unique mechanical properties of these structural materials. Since the energies of anti-phase boundary (APB) and complex stacking fault (CSF) can be increased by appropriate alloying additions, multiple research studies investigated this topic. However, the question about the stability of these defects has not received the attention it deserves. Using atomistic simulations, we found that the APB can spontaneously transform into super intrinsic stacking fault (SISF) and the CSF can spontaneously transform into L12 lattice structure. We demonstrate that Nb solutes produce very different effects in two considered cases: addition of Nb increases the temperature of spontaneous APB → SISF transformation, and decreases the temperature of spontaneous CSF → L12 transformation. These results provide a different perspective on the processes vital to fascinating mechanical properties of Ni-based superalloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Mechanical Properties, Other |