About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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Materials for High Temperature Applications: Next Generation Superalloys and Beyond
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Presentation Title |
On the High-temperature Air Oxidation Behavior of Ti3Al0.6Ga0.4C2 MAX Phase Solid-solution in the 1000 to 1300 °C Temperature Range |
Author(s) |
Tarek Ali Ali, Enrica Epifano, Maxim Sokol, Michel Barsoum |
On-Site Speaker (Planned) |
Tarek Ali Ali |
Abstract Scope |
The MAX phases, Ti2AlC and Ti3AlC2, are atomically layered ternary transition metal carbides that display damage tolerance, oxidation resistance and crack-healing behavior at high temperatures. They are recognized as alumina Al2O3 formers upon oxidation in the 1000-1200°C temperature range. However, the challenge of TiO2 formation and consequent transformation into a non-protective Al2TiO5 film at higher temperatures, has encouraged further research. In this work, bulk dense predominantly single phase Ti3Al1-xGaxC2 (x ≈ 0.4) quaternary solid-solution MAX phase was hot-pressed and its isothermal oxidation was explored in ambient air, at 1000-1300°C, for 15-300 h. At 1000°C, dense adherent alumina scale forms, with superior oxidation resistance compared to Ti3AlC2 and even Ti2AlC. At 1200°C, the scale becomes coarser with oxidation resistance approaching that of Ti3AlC2 ternary. At 1300°C, alumina scale wrinkling is observed, affecting overall integrity of the oxide scale. Moreover, nucleation of anisotropic Al2TiO5 leads to formation of underlying pores and microcracks. |
Proceedings Inclusion? |
Planned: |
Keywords |
Ceramics, High-Temperature Materials, Titanium |