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Phase transformations and modulated microstructures in Ti-Al-Nb alloys

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Abstract

The decomposition of alloys roughly based on the composition Ti3Al with ternary additions of Nb has been studied through the use of transmission electron microscopy and selected area electron diffraction. It has been shown that a wide variety of transformation behavior in the metastable high temperature β phase can be produced through varying composition, cooling rates, and heat treatment. Transformations observed during quenching from the β phase field include the formation of hcp martensite in alloys with low Nb contents, the occurrence of B2(CsCl)-type ordering over a wide composition range in alloys richer in Nb, and the formation of an “ω-type≓ phase in the parent matrix subsequent to B2 ordering. In many of the as-quenched alloys a “tweed-like≓ or modulated micro-structure is observed with accompanying elaborate networks of rel rods and local diffuse maxima in electron diffraction patterns. During aging the decomposition proceeds through a complex sequence of reactions the nature of which will be discussed below. Many of the anomalies observed in these alloys are quite similar to behavior observed during decomposition of other ordered β(B2, DO3)-type phases in a wide variety of other alloy systems.

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Authors and Affiliations

  1. Department of Metallurgical Engineering and Ma- terials Science, Carnegie Mellon University, Schenley Park, 15213, Pittsburgh, PA

    R. Strychor (Graduate Student) & J. C. Williams (Professor and Dean)

  2. Department of Metallurgy and Materials Science, University of Pittsburgh, 15261, Pittsburgh, PA

    W. A. Soffa (Professor)

Authors
  1. R. Strychor
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  2. J. C. Williams
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  3. W. A. Soffa
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Additional information

This paper is based on a presentation made in the symposium “Pre-transformation Behavior Related to Displacive Transformations in Alloys≓ presented at the 1986 annual AIME meeting in New Orleans, March 2–6, 1986, under the auspices of the ASM-MSD Structures Committee.

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Strychor, R., Williams, J.C. & Soffa, W.A. Phase transformations and modulated microstructures in Ti-Al-Nb alloys. Metall Trans A 19, 225–234 (1988). https://doi.org/10.1007/BF02652530

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