Isothermal δ/α’ Transformation and TTT Diagram in a Plutonium Gallium Alloy

Abstract

Differential scanning calorimetry (DSC) is used as an alternative approach to determining the time-temperature-transformation (TTT) diagram for the martensitic delta to alpha-prime transformation in a Pu-2.0 at% Ga alloy. Previous work sugests that the TTT diagram for a similar alloy exhibits an unusual double-C curve for isothermal holds of less than 100 minutes. Here, we extend this diagram to 18 hours, and confirm the double-C curve behavior. When the sample is cooled prior to the isothermal holds, the delta to alpha-prime transformation is observed as several overlapping exothermic peaks. These peaks are very reproducible, and they are believed to be the result of different kinds of delta to alpha-prime martensitic transformation. This may be due to the presence of different nucleation sites and/or different morphologies.

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References

  1. 1.

    F.H. Ellinger, C.C. Land and V.O. Struebing, J. Nucl. Mater., 12, 226,(1964).

    CAS  Article  Google Scholar 

  2. 2.

    S.S. Hecker, L.F. Timofeeva, Los Alamos Science, 26, 244, (2000).

    CAS  Google Scholar 

  3. 3.

    K.J.M. Blobaum, C.R. Krenn, J.N. Mitchell, J.J. Haslam, M.A. Wall, T.B. Massalaki and A.J. Schwartz : Metall. Mater. Trans. A, accepted, 2005.

  4. 4.

    P. Deloffre, PhD Thesis, Univesité Paris XI Orsay, 1997.

  5. 5.

    J.T. Orme, M.E. Faiers and B.J. Ward, Plutonium 1975 and Other Actinides, (edited by H. Blank and R. Lindner, North-Holland Publishing Company, Amsterdam, 1975), pp. 761.

    Google Scholar 

  6. 6.

    S.S. Hecker, D.R. Harbur, T.G. Zocco, Prog. Mat. Sci., 49, 429 (2004).

    CAS  Article  Google Scholar 

  7. 7.

    J.N. Mitchell, F.E. Gibbs, T.G. Zocco, R.A. Pereyra, 2001, Metall. Mater. Trans. A., 32, 649, (2001).

    Article  Google Scholar 

  8. 8.

    T.F.J. Pijpers, V.B.F. Mathot, B. Goderis, R.L. Scherrenberg and E.W. van der Vegte, Macromolecules, 35, 3601, (2002).

    CAS  Article  Google Scholar 

  9. 9.

    See a separate paper entitled “Evidence of embryo formation as a precursor to the delta to alpha-prime transformation in a Pu-Ga alloy” by K.J.M. Blobaum, C.R. Krenn, M.A. Wall, T.B. Massalski, and A.J. Schwartz in this proceedings volume.

  10. 10.

    M.E. Faiers, R.G. Loasby, B.J. Ward, J.T. Orme, B.R. Spicer, 1967, Plutonium 1965, “Plutonium.” (edited by A.E. Kay M.B. Waldron, Chapman and Hall Ltd, 1965), pp 64.

    Google Scholar 

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Correspondence to B. J. P. Oudot.

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Oudot, B.J.P., Blobaum, K.J.M., Wall, M.A. et al. Isothermal δ/α’ Transformation and TTT Diagram in a Plutonium Gallium Alloy. MRS Online Proceedings Library 893, 8930502 (2005). https://doi.org/10.1557/PROC-0893-JJ05-02

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