Abstract: International audience ; The addition of Si is known to improve the oxidation resistance of pure titanium and titanium alloys. However, most past studies concern the influence of relatively large Si contents (0.35-8 wt%), which is often incompatible with a good ductility because of the presence of Ti 5 Si 3 precipitates. This study focuses on the influence of the Si content on the high-temperature resistance of near-alpha alloys from the family of Ti6244 alloy (6% Al, 2% Sn, 4% Zr 4% Mo-wt%) with small proportions of Si. The silicon addition was found to improve the high-temperature oxidation resistance of near-alpha Ti-Al-Sn-Zr-Mo family alloys by decreasing the oxidation rate and the oxide scale thickness, as well by producing a denser oxide scale. Rutile and alumina were detected within the oxide scale by XRD and Raman spectrometry. The presence of Si is associated with the presence of larger quantities of N at the oxide/metal interface.
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