Abstract
The isothermal oxidation behaviour of a titanium ATI425® alloy was studied in dry air at 850, 900, and 1000 °C. The parabolic rate law described the oxidation kinetics; the mass gained increasing when the temperature of the tests increased. The activation energy for the process was 120 kJ/mol. This value was comparable to the activation energy calculated for oxygen dissolution within the metal and the activation energy value for the oxidation of other titanium alloys. Oxygen dissolution within the metallic matrix resulted in the formation of an alpha case region whose thickness and hardness were also a function of the temperature of the tests. The chemical composition of the oxides changed from a scale comprised mainly by rutile TiO2 at the lowest test temperature to a layer consisting of a mixture of rutile TiO2 and non-protective alumina Al2O3 clusters when the temperature of the tests increased. The oxide structures formed on the surface of the alloy were also a function of the temperature and changed from a morphology comprised of small crystals at 850 °C to bar, platelets, and whiskers when oxidation occurred at 900 and 1000 °C. The oxidation rate of the alloy was compared against kinetics values reported for the Ti-6Al-4 V system, resulting in similar oxidation rates.
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The authors would like to thank the National Council for Science and Technology of Mexico (C.O.N.A.C.Y.T.), the lecturer development program (P.R.O.D.E.P.), and Universidad Autónoma de Nuevo León for the facilities provided to develop this investigation.
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Valdés-Saucedo, O.A., Rocha-Moreno, R.C., Ramírez-Ramírez, J.H. et al. Characterization of the High Temperature Isothermal Oxidation Behaviour of an ATI425® Titanium Alloy. Oxid Met 95, 427–444 (2021). https://doi.org/10.1007/s11085-021-10032-z
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DOI: https://doi.org/10.1007/s11085-021-10032-z