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Transformations in a Ti-24AI-15Nb alloy: Part I. Phase equilibria and microstructure

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Abstract

A variety of heat treatments have been employed to explore phase equilibria and the development of microstructure in a Ti-24Al-15Nb alloy. These include solution treatments both above and below the β-transus, followed by controlled cooling and aging at temperatures high enough to preclude ω-phase formation. The phase fieldsβ, β o, α2 + βo, α2 +β o + O, andβ o + O have been identified in the alloy, and schematic time-temperature-transformation (TTT) curves are proposed for continuous cooling transformations from theβ phase. The composition of the α2 andβ o phases in the α2 +β o region and of the α2,β o and O phases in the ternary phase field have been obtained by analytical electron microscopy.

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Authors and Affiliations

  1. Defence Metallurgical Research Laboratory (DMRL), 500258, Hyderabad, India

    K. Muraleedharan (Scientist), A. K. Gogia (Scientist), T. K. Nandy (Scientist) & D. Banerjee (Associate Director)

  2. Department of Metallurgical Engineering, Institute of Technology, Banaras Hindu University, 221005, Varanasi, India

    S. Lele (Professor)

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  1. K. Muraleedharan
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  2. A. K. Gogia
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  3. T. K. Nandy
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  4. D. Banerjee
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  5. S. Lele
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Muraleedharan, K., Gogia, A.K., Nandy, T.K. et al. Transformations in a Ti-24AI-15Nb alloy: Part I. Phase equilibria and microstructure. Metall Trans A 23, 401–415 (1992). https://doi.org/10.1007/BF02801158

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  • DOI: https://doi.org/10.1007/BF02801158

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