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Experimental Determination of the Ti-Nb-Al Phase Diagram At 1200°C.

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Abstract

Studies consisting of both bulk sample and diffusion couple experiments have been conducted in order to establish an isothermal section of the Ti-Nb-Al system. Bulk samples were prepared by arc-melting and then annealed in a gettered, flowing, argon atmosphere for extended equilibration periods. The results obtained so far have established the existence of two ternary phases with the following approximate compositions, TI (Ti-18 at% Nb-34 at% Al) and T2 (Ti-ll at% Nb-44 at% Al). Moreover, several of the binary phases were found to have extensive solubilities, including the TiAl phase. The phases TiAl3 and NbAl3 form a continuous solid solution. Several heterogeneous equilibria were also determined. Determination of these phase fields was accomplished through the use of electron microprobe analysis (EMPA), x-ray diffraction, microstructural observations and backscatter electron imaging (BEI).

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Authors and Affiliations

  1. University of Wisconsin-Madison, 1509 University Ave., 53706, Madison, WI, USA

    T. J. Jewett, J. C. Lin, N. R. Bonda, L. E. Seitzman, K. C. Hsieh, Y. A. Chang & J. H. Perepezko

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  1. T. J. Jewett
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  2. J. C. Lin
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  3. N. R. Bonda
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  4. L. E. Seitzman
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  5. K. C. Hsieh
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  6. Y. A. Chang
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  7. J. H. Perepezko
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Jewett, T.J., Lin, J.C., Bonda, N.R. et al. Experimental Determination of the Ti-Nb-Al Phase Diagram At 1200°C.. MRS Online Proceedings Library 133, 69 (1988). https://doi.org/10.1557/PROC-133-69

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  • DOI: https://doi.org/10.1557/PROC-133-69

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