|About this Abstract
||3rd World Congress on High Entropy Alloys (HEA 2023)
||High Temperature Oxidation Mechanisms of NbTiZr using 18O Tracer Technique
||Charlie Brandenburg, David Beaudry, Mitra Taheri, Elizabeth Opila
|On-Site Speaker (Planned)
Refractory multi-principal element alloys (RMPEAs) are of interest for their mechanical strength at high temperature, however, rapid oxidation rates limit their use in these environments. Equimolar NbTiZr was studied as a model alloy for high temperature oxidation of RMPEAs. Double oxidation experiments using 1%O2 (balance argon) and 18O2 tracer gas were performed at 1050°C and 1250°C using a resistive heating system. Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) was used to map the distribution of 18O in sample cross-sections. 18O exposure for 1 minute and 30 seconds after oxidation at 1050 and 1250°C, respectively, resulted in an 18O reaction depth of approximately 40μm. ToF-SIMS maps of the sample oxidized at 1250°C show high concentrations of 18O in ZrO2 grains, suggesting rapid transport of oxygen within ZrO2.
||Planned: Metallurgical and Materials Transactions