Skip to main content Accessibility help
×
Home

Enabling the Double-C Curve in Pu-Ga Alloy Time-Temperature-Transformation Diagrams

  • Jason R. Jeffries (a1), Kerri J. M. Blobaum (a2), Mark A. Wall (a3) and Adam J. Schwartz (a4)

Abstract

Under ambient conditions, a Pu-2.0 at.% Ga alloy is retained in the metastable δ phase. Upon cooling to approximately -120 °C, the face-centered-cubic δ phase partially transforms to the metastable monoclinic α′ phase via a martensitic transformation. The kinetics of the δ⟶α′ transformation are reported to have double-C curve kinetics in a time-temperature-transformation (TTT) diagram, but the mechanisms responsible for this unusual behavior are not understood. Our work focuses on determining the underlying cause of the two noses. Optical microscopy has been used to investigate the role of “conditioning”—an isothermal hold at sub-anneal temperatures—on the δ⟶α′ transformation and to illuminate any disparities in transformation products. Conditioning was found to affect substantially the amount of transformation that occurs at particular points corresponding to both the upper- and lower-C of the TTT diagram.

Copyright

References

Hide All
1 Hecker, S. S. Los Alamos Sci. 26, 291335 (2000).
2 Turchi, P. E. A. Kaufman, L. Zhou, S. and Liu, Z.-K. J. Alloy Compd. 444-445, 2835 (2007).
3 Orme, J. T. Faiers, M. E. and Ward, B. J. in Plutonium 1975 and Other Actinides, edited by Blank, H. and Lindner, R. North Holland Publishing Company, Amsterdam, 1975, pp. 761773.
4 Deloffre, P. Truffier, J. L. and Falanga, A. J. Alloy Compd. 271-273, 370373 (1998).
5 Deloffre, P. Ph.D. Thesis, Université Paris XI Orsay, 1997.
6 Oudot, B. Blobaum, K. J. M., Wall, M. A. and Schwartz, A. J. J. Alloy Compd. 444-445, 230235 (2007).
7 Blobaum, K. J. M. Krenn, C. R. Wall, M. A. Massalski, T. B. and Schwartz, A. J. Acta Mater. 54, 40014011 (2006).
8 Mitchell, J. N. Gibbs, F. E. Zocco, T. G. and Pereyra, R. A. Metall. Mater. Trans. A 32A, 649659 (2001).
9 Haslam, J. J. Wall, M. A. Johnson, D. L. Mayhall, D. J. and Schwartz, A. J. in Electrically Based Microtructural Characterization III, Gerhardt, R. A. ed., Materials Research Society Symposia Proceedings, Washabaugh, A. P. Alim, M. A. and Choi, G. M. eds., Materials Research Society, Pittsburgh, PA, 2002, vol. 699, pp. 295300.
10 Blobaum, K. J. M., Krenn, C. R. Mitchell, J. N. Haslam, J. J. Wall, M. A. Massalski, T. B. and Schwartz, A. J., Metall. Mater. Trans. A 37A, 567577 (2006).
11 Zocco, T. G. Stevens, M. F. Adler, P. H. Sheldon, R. I. and Olson, G. B. Acta Metall. Mater. 38, 22752282 (1990).
12See, for example, Aaronson, H. I. Metall. Mater. Trans. 33, 22852297 (2002).

Keywords

Enabling the Double-C Curve in Pu-Ga Alloy Time-Temperature-Transformation Diagrams

  • Jason R. Jeffries (a1), Kerri J. M. Blobaum (a2), Mark A. Wall (a3) and Adam J. Schwartz (a4)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.