Air Oxidation Behaviour of a Ti-6Al-7Nb Alloy

Abstract:

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Air oxidation behavior of a Ti6Al7Nb alloy was examined over the temperature range of 873 –1173 K for different time intervals ranging in between 12 and 72 h. The rate of oxidation evaluated according to the weight gain measurements, fitted parabolic kinetics by yielding oxidation activation energy of 226 kJ/mol. Rutile and anatase modifications of TiO2 formed on the surface as the result of air oxidation. Oxidation temperatures higher than 923 K encouraged rutile formation rather than anatase. As temperature of oxidation was increased, the thickness of the oxide layer increased. Thicker oxide layer provided higher surface hardness and better protection against a corrosive media (5 M HCl solution) was provided.

Info:

Periodical:

Defect and Diffusion Forum (Volumes 297-301)

Edited by:

Andreas Öchsner, Graeme E. Murch, Ali Shokuhfar and João M.P.Q. Delgado

Pages:

1389-1394

DOI:

10.4028/www.scientific.net/DDF.297-301.1389

Citation:

M. D. Unlu et al., "Air Oxidation Behaviour of a Ti-6Al-7Nb Alloy", Defect and Diffusion Forum, Vols. 297-301, pp. 1389-1394, 2010

Online since:

April 2010

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Price:

$35.00

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