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

  • Benoit Jean-Paul Oudot (a1), Kerri Blobaum (a2), Mark Wall (a3) and Adam Schwartz (a4)

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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1. Ellinger, F.H., Land, C.C. and Struebing, V.O., J. Nucl. Mater., 12, 226,(1964).
2. Hecker, S.S., Timofeeva, L.F., Los Alamos Science, 26, 244, (2000).
3. Blobaum, K.J.M., Krenn, C.R., Mitchell, J.N., Haslam, J.J., Wall, M.A., Massalaki, T.B. and Schwartz, A.J. : Metall. Mater. Trans. A, accepted, 2005.
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5. Orme, J.T., Faiers, M.E. and Ward, B.J., Plutonium 1975 and Other Actinides, (edited by Blank, H. and Lindner, R., North-Holland Publishing Company, Amsterdam, 1975), pp. 761.
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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 Blobaum, K.J.M., Krenn, C.R., Wall, M.A., Massalski, T.B., and Schwartz, A.J. in this proceedings volume.
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Keywords

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

  • Benoit Jean-Paul Oudot (a1), Kerri Blobaum (a2), Mark Wall (a3) and Adam Schwartz (a4)

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