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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.55  No.2 (2014)  >  pp.290-297

MATERIALS TRANSACTIONS
<<Previous article Vol.55  No.2 (2014)   pp.290 - 297 Next article>>

High-Temperature Oxidation and Its Kinetics Study of Ti–Al and Ti–V Alloys in Air

Tomoshi Takahashi1), Yoritoshi Minamino2), Hideyuki Hirasawa1), Tadashi Ouchi1)
1) Department of Environmental Materials Engineering, Institute of Niihama National College of Technology 2) Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University

The high-temperature oxidation behavior of Ti–(6–36) mass%Al alloys and Ti–(4–15) mass%V alloys has been investigated in a temperature range of 1123 to 1273 K in air. A kinetic study of the oxidation has been also carried out in Ti–6 mass%Al alloy and Ti–4 mass%V alloy. The growth rate of oxides of Ti–V alloys is larger than that of Ti–Al alloys. The oxidation products have been examined by X-ray diffraction (XRD), electron probe microanalysis (EPMA) and X-ray photoelectron spectroscopy (XPS). The Al2O3 layer is probably formed in the Ti–Al/oxides interface of the Ti–6 mass%Al alloy according to the results by means of EPMA, although only the rutile TiO2 is detected by means of XRD in the oxides of surface layer in Ti–6 mass% Al alloy and Ti–4 mass%V alloy at 1273 K. Furthermore, the TiO2 and Al2O3 are observed by XPS in the surface layer of the above both alloys oxidized at 1123 K for 3.6 ks, but the V2O5 is not observed. It is found that the apparent activation energy (245 kJ/mol) for the oxidation experiment (TG experiment) at a constant heating rate is fairly equal to the activation energy (253 kJ/mol) for the isothermal oxidation in Ti–6 mass%Al alloys.


Keyword:
high-temperature oxidation, titanium–aluminum and titanium–vanadium alloys, kinetic study

Received: August 05, 2013
Accepted: November 06, 2013 , Published online: January 25, 2014
Copyright © 2014 The Japan Institute of Light Metals

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