| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2024
|
| Presentation Title |
Destructive Oxidation of Ta and its Alloys at Temperatures up to 1000 °C |
| Author(s) |
Christopher Barret Finfrock, Zahra Ghanbari, Norm Bartelt, Peter Sharma, Josh Sugar, Michael Rene Lopez-Duran, Charles Robino |
| On-Site Speaker (Planned) |
Christopher Barret Finfrock |
| Abstract Scope |
In high-temperature environments, Ta-based alloys are susceptible to oxidation-induced embrittlement, which can cause a nil-ductility condition despite their notionally high-toughness. The phenomenological roots of O-based embrittlement in Ta alloys are not obvious and oxidation kinetics have mostly been explored at exceedingly high temperatures. Meanwhile, there is a lack of understanding of oxidation kinetics and their effects on toughness over low to intermediate temperatures. Here, we evaluate oxidation susceptibility of three Ta-W alloys over temperatures from 20 to 1000 °C. The bulk O-uptake kinetics and energetics were measured in-situ by a combination of TGA and DSC. Subsequently, chemical-microstructure-property interactions were further explored using spatially-resolved chemical and micro-mechanical analysis. Finally, atomistic simulations of alloy and defect interactions are used to interpret physical oxidation kinetics data. These data may be useful for improving oxidation resistance via alloy selection and microstructure design.
SNL_is_managed_and_operated_by_NTESS_under_DOE_NNSA_contract_DE-NA0003525 |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, Characterization, High-Temperature Materials |