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Meeting MS&T23: Materials Science & Technology
Symposium High Temperature Corrosion and Degradation of Structural Materials
Presentation Title Cyclic Oxidation of NbTiZr Using a Resistive Heating System
Author(s) Charlie Brandenburg, David Beaudry, Jean-Philippe Couzinié, Loïc Perrière, Mitra Taheri, Elizabeth Opila
On-Site Speaker (Planned) Charlie Brandenburg
Abstract Scope 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 oxidized at 1250°C in 1%O2 (balance argon) using a resistive heating system. The oxide microstructure of samples oxidized continuously for 5 minutes at 1250° was compared to that of samples oxidized in five one-minute cycles and cooled to room temperature between cycles. The continuously oxidized samples showed grain boundary oxidation and oxide grain growth perpendicular to the surface. The cyclically oxidized samples showed globular phase separation of Zr and Nb, which acted as a template for oxide microstructure during later cycles. No oxide spallation was observed on cooling in both oxidation conditions. Lower metal consumption during the cyclic oxidation exposure shows that initial phase separation morphology affects oxidation rate.


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