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Influence of oxygen ingress on fine scale precipitation of α-Ti during oxidation of Beta21S β-Ti alloy

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Abstract

The formation of a surface oxide layer along with α precipitation in the subsurface oxygen-enriched zone, during the oxidation of a β-Ti alloy, has been investigated using scanning electron microscopy, electron probe micro analysis, X-ray diffraction, (Scanning) transmission electron microscopy, 3D-Atom Probe studies, and nano-indentation. Immediately below the nanocrystalline oxide layer, a two-phase mixture consisting of nanoscale equiaxed α grains and rutile grains are formed. With increasing depth, the α morphology below the oxide layer varied from nanoscale equiaxed to lathlike, coupled with substantial changes in size-scale and nucleation density of α precipitates. A distinct change in the lattice parameters of α and β phases below the oxide layer and the overall micro hardness of the material is also noted. The role of oxygen ingress on the scale and morphology of α precipitation has been discussed.

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Authors and Affiliations

  1. Center for Advanced Research and Technology, Department of Materials Science and Engineering, University of North Texas, Denton, TX, 76203, USA

    A. Behera, S. Nag, K. Mahdak, H. Mohseni & R. Banerjee

  2. Materials and Manufacturing Directorate, Air Force Research Laboratory, Dayton, OH, 45309, USA

    J. Tiley

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  1. A. Behera
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  2. S. Nag
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  3. K. Mahdak
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  4. H. Mohseni
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  5. J. Tiley
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  6. R. Banerjee
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Correspondence to R. Banerjee.

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Behera, A., Nag, S., Mahdak, K. et al. Influence of oxygen ingress on fine scale precipitation of α-Ti during oxidation of Beta21S β-Ti alloy. J Mater Sci 48, 6700–6706 (2013). https://doi.org/10.1007/s10853-013-7470-y

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  • DOI: https://doi.org/10.1007/s10853-013-7470-y

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