Hostname: page-component-7479d7b7d-qs9v7 Total loading time: 0 Render date: 2024-07-11T00:35:23.326Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Published online by Cambridge University Press:  26 February 2011

Benoit Jean-Paul Oudot ,
Kerri Blobaum ,
Mark Wall  and
Adam Schwartz
Benoit Jean-Paul Oudot
Affiliation:
oudot2@llnl.gov, Lawrence Livermore National Laboratory, Chemistry and Materials Science Directorate, 7000 East Avenue, Livermore, CA, 94550, United States, 925-422-5495
Kerri Blobaum
Affiliation:
blobaum1@llnl.gov, Lawrence Livermore National Laboratory, Chemistry and Materials Science Directorate, United States
Mark Wall
Affiliation:
wall1@llnl.gov, Lawrence Livermore National Laboratory, Chemistry and Materials Science Directorate, United States
Adam Schwartz
Affiliation:
schwartz6@mail.llnl.gov, Lawrence Livermore National Laboratory, Physics and Advanced Technologies Directorate, United States
Get access

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.

Keywords

Puphase transformationactinide
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 893: Symposium JJ – Actinides 2005 – Basic Science, Applications and Technology , 2005 , 0893-JJ05-02
Copyright
Copyright © Materials Research Society 2006

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Ellinger, F.H., Land, C.C. and Struebing, V.O., J. Nucl. Mater., 12, 226,(1964).Google Scholar
2. Hecker, S.S., Timofeeva, L.F., Los Alamos Science, 26, 244, (2000).Google Scholar
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.Google Scholar
4. Deloffre, P., PhD Thesis, Univesité Paris XI Orsay, 1997.Google Scholar
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.Google Scholar
6. Hecker, S.S., Harbur, D.R., Zocco, T.G., Prog. Mat. Sci., 49, 429 (2004).Google Scholar
7. Mitchell, J.N., Gibbs, F.E., Zocco, T.G., Pereyra, R.A., 2001, Metall. Mater. Trans. A., 32, 649, (2001).Google Scholar
8. Pijpers, T.F.J., Mathot, V.B.F., Goderis, B., Scherrenberg, R.L. and van der Vegte, E.W., Macromolecules, 35, 3601, (2002).Google Scholar
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.Google Scholar
10. Faiers, M.E., Loasby, R.G., Ward, B.J., Orme, J.T., Spicer, B.R., 1967, Plutonium 1965, “Plutonium.” (edited by Kay, A.E. Waldron, M.B., Chapman and Hall Ltd, 1965), pp 64.Google Scholar