Influence of alloying elements on the dissolution of oxygen in the metallic phase during the oxidation of titanium alloys
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- Chaze, A.M. & Coddet, C. J Mater Sci (1987) 22: 1206. doi:10.1007/BF01233110
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In order to study the influence of aluminium, chromium and silicon on the dissolution of oxygen in the metallic phase during the oxidation of titanium-based alloys, unalloyed titanium Ti35 and the alloys Ti-Al (1.65, 3, 5 and 10% by weight of aluminium), Ti-Cr (1, 4, 11 and 19% by weight of chromium) and Ti-Si (0.25, 0.5 and 1% by weight of silicon) were oxidized in air and in oxygen for durations of up to several thousand hours, between 550 and 700° C. The influence of the alloying elements was studied using microhardness measurements in the metallic zone just beneath the oxide. It was observed that aluminium and silicon cause a significant reduction in the amount of oxygen dissolved in the metallic phase whereas the effect of chromium is negligible. A comparison of the oxidation behaviour of unalloyed titanium in air and in oxygen reveals the marked influence of nitrogen on the dissolution of oxygen into the substrate, causing a reduction in the amount of dissolved oxygen. In addition, for oxidation of the alloys in air, a synergistic effect is observed, particularly between nitrogen and silicon.