Various aspects of the air oxidation behaviour of a Ti6Al4V alloy at temperatures in the range 600–700 °C
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A study on the air oxidation behaviour of a commercially pure Ti6Al4V alloy between 600 and 700 °C is reported, based on determination of the kinetic curves, microhardness profiles in the metal beneath the scale, and examination of morphology and composition of the scales. The oxidation kinetics shows a gradual transformation dependent on both time and temperature from a diffusive to a nearly linear rate law. It has been observed that such transformation may be associated with the acceleration of oxide scale growth. This phenomenon is accompanied by a parallel change of the oxide morphology, which is essentially manifested with the onset of a duplex-type scale starting from 650 °C. Aluminium is found to pile up near the external surface of the oxide scales, although the presence of a continuous film of alumina may be excluded under any circumstances. Finally, the effect of aluminium and vanadium is beneficial in reducing appreciably the amount of oxygen dissolved in the surface metal layer, compared with unalloyed titanium.
KeywordsTitanium Vanadium External Surface Oxide Scale Metal Layer
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- 4.C. E. Shamben and T. K. Redden, “Science and Technology and Application of Titanium” by R. I. Jaffee and N. E. Promisel eds. (Pergamon, Oxford, 1966) p. 199.Google Scholar
- 5.D. J. Lainer, E. N. Slesareva, M. J. Tsipin and A. S. Bai, Zashch. Met. (USSR) 2 (1966) 692.Google Scholar
- 6.V. M. Popova, Z. I. Kornilova and E. M. Lazarev, ibid 10 (1974) 345.Google Scholar
- 7.I. A. Menzies and K. N. Strafford, in “Proceedings of the 3rd International Congress on Corrosion of Metals”, Vol. 4 (Mir, Moscow, 1968) p. 93.Google Scholar
- 12.G. Welsh and A. I. Kahveci, in “Proceedings of the Workshop on Oxidation of High-Temperature Intermetallics”, Cleveland OH, 22–23 September 1988. T. Grobstein and J. Duychak eds. (The Minerals, Metals and Materials Society, Warrendale, PA, 1989), p. 207.Google Scholar
- 13.G. H. Meier and D. Apollonia, ibid, T. Grobstein and J. Duychak eds. (The Minerals, Metals and Materials Society, Warrendale, PA, 1989) p. 185.Google Scholar
- 18.A. Andersson and S. L. T. Andersson, in “Solid State Chemistry in Catalysis”, R. K. Grasselli and J. F. Brazdil, eds. (American Chemical Society Symposium Series 279 Washington, DC, 1983) p. 121.Google Scholar
- 19.H. Kung, in “Transition Metal Oxides: Surface Chemistry and Catalysis”, edited by B. Delmon and J. T. Yates (Elsevier, Amsterdam, 1989) p. 12.Google Scholar
- 20.A. E. Jenkins, J. Inst. Metals. 82 (1953-54) 213.Google Scholar