About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Local Chemical Ordering and Its Impact on Mechanical Behaviors, Radiation Damage, and Corrosion
|
| Presentation Title |
Local Ordering Along Stacking Faults: Kinetic Aspects and Their Impact on Creep in Superalloys |
| Author(s) |
Andreas Bezold, Jan Vollhüter, Nicolas Karpstein, Ashton Egan, Erdmann Spiecker, Steffen Neumeier, Michael J. Mills |
| On-Site Speaker (Planned) |
Andreas Bezold |
| Abstract Scope |
Solute segregation to planar defects during high-temperature deformation in superalloys can locally transform stacking faults into either disordered or ordered stacking fault phases, which are detrimental or beneficial for creep resistance, respectively. In this work, we show that not only thermodynamic factors but also kinetic processes play an important role in improving creep resistance. High-resolution scanning transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy are utilized to analyze the segregation profiles along stacking faults over four orders of magnitude (30 seconds to 200 hours) at 850 °C. Subsequently, we examine the creep and local phase transformation behavior along stacking faults in two polycrystalline cast&wrought superalloys. Our findings highlight the necessity to rapidly achieve local ordering along these faults to suppress detrimental mechanisms such as microtwinning and improve creep resistance. Based on these insights, we propose alloy design strategies to facilitate and accelerate local ordering along stacking faults for next-generation superalloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Phase Transformations, Characterization |