|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Titanium Technology
||High-temperature Oxidation Behavior of Dilute Ti-Si Alloys at 800 °C
||Thomas Valenza, Emmanuelle Marquis
|On-Site Speaker (Planned)
Pure titanium and titanium alloys possess high specific strength and good corrosion resistance, making them well suited to structural applications in various corrosive environments. However, their use is limited to approximately 550 °C because of rapid oxidation at higher temperatures. Although alloying with Si is known to significantly reduce oxidation rates, the mechanisms remain disputed and are likely influenced by nitrogen. We compared the oxidation kinetics of pure Ti and a dilute Ti-Si alloy at 800 °C and characterized the local microstructures and compositions of the scale and underlying metal. In Ar-O2, Si led to a dramatic reduction in scale thickness, partly associated with the formation of a continuous silicide layer between the scale and metal. In N2-O2, the alloy exhibited reduced oxygen dissolution in the metal, which may be associated with the combination of a compact scale and the presence of N in solid solution below the scale.
||Titanium, High-Temperature Materials, Other