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Transformations in a Ti-24Al- 15Nb alloy: Part II. a composition invariant βo → O transformation

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Abstract

This article explores the nature of a composition invariant phase transformation fromβ o(B2, Ti2AlNb) to an orthorhombic O phase (Cmcm) on aging aβ quenched Ti-24Al-15Nb alloy. The transformation product is shown to contain a variety of defect structures whose origins are analyzed and explained. The orthorhombic phase is shown in exist in two forms: (1) in which the Nb atoms occupy a specific sublattice and (2) in which the Nb and Ti atoms randomly occupy the same sublattice. The subsequent decomposition of the metastable O product into the equilibrium phases is also described.

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Authors and Affiliations

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

    K. Muraleedharan (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)

Authors
  1. K. Muraleedharan
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  2. T. K. Nandy
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  3. D. Banerjee
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  4. S. Lele
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Muraleedharan, K., Nandy, T.K., Banerjee, D. et al. Transformations in a Ti-24Al- 15Nb alloy: Part II. a composition invariant βo → O transformation. Metall Trans A 23, 417–431 (1992). https://doi.org/10.1007/BF02801159

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  • DOI: https://doi.org/10.1007/BF02801159

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