| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials Design Approaches and Experiences V
|
| Presentation Title |
Equilibrium Segregation and Localized Phase Transition at Stacking Faults in Ni-based Superalloys |
| Author(s) |
Longsheng Feng, You Rao, Ashton Egan, Michael J Mills, Maryam Ghazisaeidi, Yunzhi Wang |
| On-Site Speaker (Planned) |
Longsheng Feng |
| Abstract Scope |
Suzuki segregation has long been identified and verified in the experiment. Recent experiment findings suggest solute segregation may play an important role in the deformation process during creep. Interfacial segregation isotherm is adopted to predict the equilibrium solute concentration at the stacking fault. First principle calculations are used for solute-SF interaction. A clear correspondence between segregation enthalpy and solute enrichment is shown. The simulation predictions agree well with experimental observations. Moreover, localized phase transformation (LPT) inspired by segregation transition is studied through phase field simulations. The simulation results show that LPT occurs locally at stacking faults and the precipitate phase produced is confined locally at the faults and cannot growth into the bulk. The impact of such localized precipitates on the deformation behavior of the alloy will also be discussed. This work is supported by NSF under DMREF program. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |