Abstract Niobium-platinum samples of compositions ranging from 16 to 32 at. % have been undercooled to as much as 540 K in the low gravity, containerless environment of the 105 meter drop tube located at the George C. Marshall Space Flight Center. Undercooling was terminated in the Nb-Pt samples by the nucleation and growth of the Nb3Pt phase. In the 16–18 at. % Pt samples, this resulted in samples which are completely Nb3Pt, in contrast to both the equilibrium phase diagram and the non-undercooled samples which formed with Nb dendrites and interdendritic Nb3Pt. Undercoolings for the Nb-Si samples were up to 670 K, which corresponds to 27% of the liquidus temperature or 80% of the estimated hypercooling limit. In the Nb-Si system, a coupled zone was identified as well as a metastable extension of the solubility limit of Si in Nb due to deep undercooling.


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    Titel :

    Undercooling studies on Nb-Pt and Nb-Si alloys using the 105 meter drop tube


    Beteiligte:
    Robinson, M.B. (Autor:in) / Bayuzick, R.J. (Autor:in) / Hofmeister, W.H. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 8 , 12 ; 321-330


    Erscheinungsdatum :

    01.01.1989


    Format / Umfang :

    10 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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    Robinson, M. B. / Bayuzick, R. J. / Hofmeister, W. H. | NTRS | 1988


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    Alloy Undercooling Experiments

    M. C. Flemings / D. M. Matson | NTIS | 1995


    Alloy undercooling experiments

    Flemings, Merton C. / Matson, Douglas M. | NTRS | 1995