About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrahigh-Temperature Processing and Manufacturing
|
| Presentation Title |
Real-time Visualization of Far-from-equilibrium Oxidation at Ultra-high Temperatures |
| Author(s) |
Jinpeng Pu, Yizheng Chen, Vaibhav Ayra, Xinzhao Jia, Shugang Deng, Pengfei Xia, Caiying Yao, Xizheng Wang |
| On-Site Speaker (Planned) |
Jinpeng Pu |
| Abstract Scope |
Oxidation at ultrahigh temperatures often proceeds through transient, far-from-equilibrium pathways that are difficult to resolve using thermogravimetry or post-mortem characterization. Here we report a high-speed microscopic imaging platform for in situ visualization of oxide formation during rapid Joule heating. Combining in situ optical microscopy, color-ratio pyrometry, and image post-processing, the platform tracks oxide evolution with ~10 µm/pixel spatial resolution and temporal resolution up to ~100 µs/frame. Using HfZrTiTa refractory multi-principal element alloy as a model system, we monitor oxidation at 1500, 1800, and 2000 K during 40 s exposures in an oxygen-containing environment. Correlative microstructural analyses show that increasing temperature slows optically detected surface oxide coverage while increasing oxidation-layer thickness, revealing decoupled surface oxide spreading and inward oxygen transport. We attribute this behavior to competition among temperature-enhanced oxygen diffusion, Ti enrichment, and Hf-Zr-O/HfOₓ formation, enabling mechanistic understanding and materials design under far-from-equilibrium conditions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, High-Entropy Alloys, |