Abstract
Poor oxidation resistance is a key contributor to material failure within extreme environments. Understanding oxygen solubility is important for computation aided design of new high strength, high-temperature oxidation resistant alloys. Oxygen solubility within pure metals, such as Ni, has been studied using a multitude of techniques, but Atom Probe Tomography (APT) has not been used for such a measurement to date. APT is the only technique offering both a high chemical sensitivity (<10 ppm) and resolution (<1 nm) allowing for a composition measurement within nms of the oxide/metal interface. APT was employed to measure the oxygen content at different depths from the oxide/metal interface as well as grain boundaries for a high and low purity Ni sample oxidized at 1000 °C for 48 h. The results reveal <10 s of ppm oxygen solubility within Ni metal at all depths and 100 s of ppm oxygen within GBs.
| Original language | English |
|---|---|
| Article number | 114411 |
| Journal | Scripta Materialia |
| Volume | 210 |
| DOIs | |
| State | Published - Mar 15 2022 |
Funding
APT was conducted at ORNL's Center for Nanophase Materials Sciences (CNMS), which is a U.S. DOE Office of Science User Facility. The authors would like to thank the U.S. Department of Energy , Office of Energy Efficiency and Renewable Energy , Vehicle Technologies Office, Propulsion Materials Program, and the U.S. Department of Energy , Office of Fossil Energy , eXtreme environment MATerials ( XMAT ) consortium for funding this work. Andrew J. Breen acknowledges funding through the Australian Department of Industry, Innovation and Science under the auspices of the AUSMURI program. The authors would like to thank James Burns for assistance in performing APT sample preparation and running the APT experiments. APT was conducted at ORNL's Center for Nanophase Materials Sciences (CNMS), which is a U.S. DOE Office of Science User Facility. The authors would like to thank the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office, Propulsion Materials Program, and the U.S. Department of Energy, Office of Fossil Energy, eXtreme environment MATerials (XMAT) consortium for funding this work. Andrew J. Breen acknowledges funding through the Australian Department of Industry, Innovation and Science under the auspices of the AUSMURI program. The authors would like to thank James Burns for assistance in performing APT sample preparation and running the APT experiments.
Keywords
- Atom Probe Tomography
- Grain Boundaries
- Nickel
- Oxidation
- Oxygen Solubility