|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Advances in Titanium Technology
||M-3: Numerical Analysis of Oxide Growth and Oxygen Dissolution during High-temperature Oxidation of Ti–Al Alloys
||Tomonori Kitashima, Makoto Watanabe
|On-Site Speaker (Planned)
During the oxidation of Al-added Ti alloys, Al2O3 and TiO2 grow on the metal surface, and oxygen penetrates from the surface into the metal substrate due to the high-solubility limit of oxygen in alpha Ti. In this study, the weight gains caused by Al2O3 and TiO2 growth and oxygen dissolution were separately estimated in Ti–Al alloys using the one-dimensional finite volume method coupled with the calculation of phase diagrams method. Moreover, the temporal evolution of elemental concentrations in the substrate was simulated at the metal/oxide interface. As a result, the weight gain caused by Al2O3 growth was found to be much smaller than that generated by TiO2 in Ti–6.5wt%Al. After 20 h, the Al2O3 thickness was estimated to be ~20 nm. During the first stage of oxidation, Al2O3 continuously formed, although oxygen concentration increased at the metal/surface interface and Al concentration decreased drastically because of TiO2 formation.
||Titanium, Environmental Effects,