Abstract
Oxidation behavior of Ti–4Al–2V alloy in air was studied by isothermal thermogravimetry. It was found that the oxidation kinetics are parabolic in the temperature range 450–700 °C. The activation energies for reaction of titanium with oxygen and oxide growth were calculated as 90 and 114 kJ/mol, respectively. Microhardness measurements showed that thermal oxidation at 700 °C could increase the depth of subsurface diffusion zone up to 150 μm. The morphological studies of oxidized surfaces revealed that the thermal oxidation at 700 °C led to scaling and eventual detachment of the scale from the substrate due to the cracking at the metal/oxide interface.
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Acknowledgments
The authors are grateful to the Sahand University of Technology, Tabriz – Iran, for supporting this research and provision of laboratory facilities and Technical University of Ostrava for provision of laboratory facilities. The Authors would like to acknowledge from professor Kamil Postava and professor Bohumir Strnadel from Technical University of Ostrava (VSB) for their technical and scientific supports.
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Omidbakhsh, F., Ebrahimi, A.R. & Sojka, J. A Kinetics and Morphological Study on the Oxidation Behavior of Ti–4Al–2V Alloy. Oxid Met 84, 33–44 (2015). https://doi.org/10.1007/s11085-015-9539-2
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DOI: https://doi.org/10.1007/s11085-015-9539-2