Reactivity
of a Ti–45.9Al–8Nb alloy in air at 700–900°C |
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Authors: | El?bieta Godlewska M Mitoraj F Devred B E Nieuwenhuys |
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Institution: | (1) Faculty of Material Science and Ceramics, AGH-UST, Krakow, Poland;(2) University of Leiden, The Netherlands |
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Abstract: | A Ti–45.9Al–8Nb
(at%) alloy with a lamellar structure (γ+α2)
was oxidised in air at 700, 800, 850 and 900°C in isothermal and thermal
cycling conditions. The reaction progress was followed by thermogravimetric
measurements. In isothermal conditions the oxidation kinetics followed approximately
a parabolic rate law and the rate constants ranged from about 10–12
kg2 m–4 s–1
at 700°C to 10–10 kg2
m–4 s–1
at 900°C. The oxide scales were built of Al2O3
and TiO2, the former being the main component of the
outermost layer. The oxidation behaviour of Ti–45.9Al–8Nb was
referred to a commercial titanium alloy, WT4 (Ti–6Al–1Mn), and
selected oxidation-resistant alloys. |
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Keywords: | oxidation kinetics oxide scale structure and composition γ -TiAl |
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