Reactivity of a Ti–45.9Al–8Nb alloy in air at 700–900°C

• DOI: 10.1007/s10973-006-8291-x
• Publication Date: 2007-04-07T23:41:37Z
• Authors: Elżbieta Godlewska; M. Mitoraj; F. Devred; B. E. Nieuwenhuys
• Keywords: Isothermal process; Thermogravimetric analysis; Titanium alloy; Reactivity

A Ti-45.9Al-8Nb (at%) alloy with a lamellar structure (gamma +alpha 2) was oxidised in air at 700, 800, 850 and 900 DegC in isothermal and thermal cycling conditions. The reaction progress was followed by thermogravimetric measurements. In isothermal conditions the oxidn. kinetics followed approx. a parabolic rate law and the rate consts. ranged from about 10-12 kg2 m-4 s-1 at 700 DegC to 10-10 kg2 m-4 s-1 at 900 DegC. The oxide scales were built of Al2O3 and TiO2, the former being the main component of the outermost layer. The oxidn. behavior of Ti-45.9Al-8Nb was referred to a com. titanium alloy, WT4 (Ti-6Al-1Mn), and selected oxidn.-resistant alloys. [on SciFinder (R)]