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Interphase boundary structures associated with diffusional phase transformations in Ti-base alloys

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Abstract

Interphase boundary structures generated during diffusional transformations in Ti-base alloys, especially the proeutectoid α and eutectoid reactions in a β-phase matrix, are reviewed. Partially coherent boundaries are shown to be present whether the orientation relationship between precipitate and matrix phases is rational or irrational. Usually, these structures include both misfit dislocations and growth ledges. However, grain boundary α allotriomorphs (GBA’s) do not appear to develop misfit dislocations at partially coherent boundaries. Evidently, these dislocations can be replaced by ledges which provide a strain vector in the plane of the interphase boundary. The bainite reaction in Ti-X alloys produces a mixture of eutectoid α and eutectoid intermetallic compound. Both eutectoid phases are partially coherent with theβ matrix, and both grow by means of the ledge mechanism, though unlike pearlite the ledge systems of the two phases are structurally independent. Even after deformation and recrystallization, the boundaries between the eutectoid phases and theβ matrix, as well as between these phases, are partially coherent. Titanium and zirconium hydrides have partially coherent interphase boundaries with respect to theirβ matrix. The recent observation of ledgewise growth of γ TiH within situ high-resolution transmission electron microscopy (HRTEM) suggests that, repeated suggestions to the contrary, these hydrides do not grow by means of shear transport of Ti atoms at rates paced by hydrogen diffusion.

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Authors and Affiliations

  1. Department of Metallurgical Engineering and Materials Science, Carnegie Mellon University, 15213, Pittsburgh, PA

    T. Furuhara (Graduate Student) & H. I. Aaronson (Mehl Professor)

  2. Korea Standards Research Institute, Pressure and Vacuum Laboratory, Taedok Science Town, P.O. Box 3, 300-651, Taejon, Chungnam, Republic of Korea

    H. J. Lee

  3. Department of Materials Science and Mineral Engineering, University of California, 94720, Berkeley, CA

    E. S. K. Menon

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  1. T. Furuhara
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  2. H. J. Lee
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  4. H. I. Aaronson
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This paper is based on a presentation made in the symposium “Interfaces and Surfaces of Titanium Materials” presented at the 1988 TMS/AIME fall meeting in Chicago, IL, September 25–29, 1988, under the auspices of the TMS Titanium Committee.

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Furuhara, T., Lee, H.J., Menon, E.S.K. et al. Interphase boundary structures associated with diffusional phase transformations in Ti-base alloys. Metall Trans A 21, 1627–1643 (1990). https://doi.org/10.1007/BF02672578

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