|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Grain Boundaries and Interfaces: Metastability, Disorder, and Non-Equilibrium Behavior
||Atom Probe Tomography Reveals Nickel’s Oxygen Solubility in Grains and Grain Boundaries after Oxidation
||Jonathan Poplawsky, Rishi Pillai, QingQiang Ren, Andrew Breen, Baptiste Gault, Michael Brady
|On-Site Speaker (Planned)
Oxidation resistance is important for material longevity within extreme environments. Accurate oxygen solubility measurements are necessary for computationally designing new high-strength, high-temperature oxidation resistant alloys. The 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 this measurement. APT is advantageous because it offers a high chemical sensitivity (<10 ppm) and resolution (<1 nm) allowing for composition measurements within grain boundaries and nms of the oxide/metal interface. These regions were measured for a high and low purity Ni sample oxidized at 1000 °C for 48 hours by APT. The results show <10s of ppm oxygen solubility at all depths and 100s of ppm oxygen within GBs, suggesting that grain boundary diffusion is the most likely oxygen transport mechanism. APT was conducted at the CNMS, which is a U.S. DOE Office of Science user facility.
||Characterization, High-Temperature Materials, Copper / Nickel / Cobalt