|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Advances in Titanium Technology
||The Effect of Dilute Si/Nb Alloying on High-temperature Oxidation of Titanium
||Thomas Valenza, Emmanuelle Marquis
|On-Site Speaker (Planned)
Because of their high specific strength and good corrosion resistance, pure titanium and titanium alloys are well suited to structural applications in corrosive environments. However, rapid oxidation at high temperatures limits their use to approximately 550 °C. Although dilute Si/Nb alloying is known to be particularly effective at increasing oxidation resistance, both in pure O2 and more so in N2-containing atmospheres, mechanisms remain disputed. We oxidized pure Ti, Ti-0.8 at.% Si, and Ti-2 at.% Nb at 800 °C in Ar-O2 and N2-O2 and characterized the local microstructures and compositions of the scale and underlying metal. Si/Nb alloying led to moderate reductions in scale thickness in Ar-O2, and, in N2-O2, further reductions in scale thickness and sustained reductions in 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, Other, Phase Transformations