Effects of Al and refractory alloying elements (W, Ta and Hf) on oxidation kinetics, oxygen dissolution and diffusion in titanium alloys - Archive ouverte HAL
Journal Articles Corrosion Science Year : 2024

Effects of Al and refractory alloying elements (W, Ta and Hf) on oxidation kinetics, oxygen dissolution and diffusion in titanium alloys

Abstract

The effect of aluminium, tungsten, tantalum and hafnium on the oxidation behaviour of titanium was investigated. Model alloys were oxidized in air for 5000 h at 650°C. All alloying elements decreased oxide growth and oxygen dissolution in the metal; tungsten was the most efficient. The oxygen diffusivity decreased with aluminium. Tungsten enhanced the formation of Ti$_2$N at the oxide/metal interface which decreased oxygen dissolution in the alloys. Experiments in Ar-20%O$_2$, where Ti$_2$N could not form, confirmed the major role of nitrogen on the oxidation resistance of tungsten-containing alloys. The ternary model alloy Ti-10Al-2W outperformed the high-temperature alloy Ti6242S.
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Friday, January 31, 2025
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Friday, January 31, 2025
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Dates and versions

hal-04677286 , version 1 (11-09-2024)

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Kevin Gautier, Enrica Epifano, Thomas Gheno, Damien Connétable, Daniel Monceau. Effects of Al and refractory alloying elements (W, Ta and Hf) on oxidation kinetics, oxygen dissolution and diffusion in titanium alloys. Corrosion Science, 2024, 237, pp.112330. ⟨10.1016/j.corsci.2024.112330⟩. ⟨hal-04677286⟩
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