| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments
|
| Presentation Title |
Atom Probe Characterization of Al/Mo Effects on α’ Precipitation in FeCrAl Cladding Alloys |
| Author(s) |
Nathan Almirall, Andrew Hoffman, Rajnikant Umretiya, Michael Worku, Christopher Perlee, Raul Rebak, Hamdy Abouelella |
| On-Site Speaker (Planned) |
Nathan Almirall |
| Abstract Scope |
FeCrAl alloys possess high temperature strength and oxidation resistance desirable for nuclear fuel cladding in loss of coolant accident scenarios. In order to qualify the next generation of UO2 fuel cladding, the safe operation of neutron irradiated FeCrAl alloys must be verified. One outstanding issue in the FeCrAl alloy system is the irradiation-enhanced Cr-rich α’ precipitation causing hardening and corresponding embrittlement. Crucially, the thermo-kinetic effect of Al & Mo alloying additions on the α’ precipitation is not fully understood. Al and Cr additions provide corrosion resistance by forming passive oxides. However, recent aging studies observed that while Al suppresses the α’ precipitation by lowering the miscibility gap, it may simultaneously enhance precipitation kinetics. This presentation covers results from Atom Probe Tomography (APT) to characterize the GRC key fuel cladding alloy FA-SMT (Fe21Cr5Al3Mo) to gain a better understanding of the Al/Mo effect on α’ precipitation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, High-Temperature Materials, Environmental Effects |