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Phase Transformations in Nb-Al-Ti alloys

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Abstract

Phase relationships as well as morphological and crystallographic features in Nb-rich Nb-Al and Nb-Al-Ti alloys have been investigated. The phase boundaries involving the bcc and Nb3Al (A15 structure) were experimentally determined and several isothermal sections of the Nb-rich corner of the Nb-AI-Ti phase diagram established. The present findings show that (a) the solubility of Al in Nb is considerably less than that reported previously, (b) the high-temperature bcc phase undergoes an ordering transformation to the B2 structure, and (c) the ω phase also forms in these alloys. The sequence of decomposition of the high-temperature bcc phase during isothermal decomposition in the bcc + Nb3Al phase field has been systematically studied in these alloys. A wide variety of morphological features were found to be associated with the Nb3Al precipitates that formed in the bcc/B2 matrix during isothermal heat treatments. The lengthening kinetics of the plate-shaped Nb3Al precipitates were also studied.

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Authors and Affiliations

  1. Materials Science Section, Department of Mechanical Engineering, US Naval Postgraduate School, 93943-5100, Monterey, CA

    E. S. K. Menon (Research Assistant Professor)

  2. UES Inc., 45432-1894, Dayton, OH

    P. R. Subramanian (Scientist)

  3. MLLM, USAF Wright Laboratory, Materials Directorate, 45433-7817, Wright-Patterson AFB, OH

    D. M. Dimiduk (Group Leader)

Authors
  1. E. S. K. Menon
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  2. P. R. Subramanian
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  3. D. M. Dimiduk
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Additional information

This article is based on a presentation made during TMS/ASM Materials Week in the symposium entitled “Atomistic Mechanisms of Nucleation and Growth in Solids,” organized in honor of H.I. Aaronson’s 70th Anniversary and given October 3–5, 1994, in Rosemont, Illinois.

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Menon, E.S.K., Subramanian, P.R. & Dimiduk, D.M. Phase Transformations in Nb-Al-Ti alloys. Metall Mater Trans A 27, 1647–1659 (1996). https://doi.org/10.1007/BF02649822

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