About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2026 – A Memorial to Todd Leonhardt
|
| Presentation Title |
Toward Understanding High-Temperature Oxidation Mechanisms in Sn-Modified Nb-Si-Based Alloys |
| Author(s) |
Sae Matsunaga, Aya Ajina, Yoko Yamabe-Mitarai |
| On-Site Speaker (Planned) |
Sae Matsunaga |
| Abstract Scope |
Nb-Si-based alloys offer excellent phase stability and high-temperature mechanical performance, yet their poor oxidation resistance remains a major barrier to practical application. These alloys are prone to catastrophic ‘pest’ oxidation at intermediate temperatures, while their oxidation rates slow down at higher temperatures. Despite extensive research, the underlying mechanisms driving both pest oxidation and severe high-temperature degradation remain poorly understood. This study aims to advance the fundamental understanding of oxidation mechanisms across a wide temperature range, utilizing Nb-Si-based alloys with the addition of Sn, which was reported to suppress the pest oxidation over a wide temperature range. In this presentation, we will share recent findings on the effect of Sn on oxidation behavior and mechanisms in Nb-Si-Al and Nb-Si-Zr systems. We will discuss the relationships among alloying additions, phase stability, oxidation resistance, and degradation mechanisms at both intermediate and high temperatures. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
High-Temperature Materials, Environmental Effects, |