Skip to main content Accessibility help
×
Home

Transformation Crystallography and Plasticity of the δ→α′ Transformation in Plutonium Alloys

  • C. R. Krenn (a1), M. A. Wall (a1) and A. J. Schwartz (a1)

Abstract

In delta phase Pu-Ga alloys, the transformation from the ductile face-centered cubic (fcc) δ phase that is retained at room temperature to the brittle low-temperature monoclinic alpha-prime phase is a thermally activated diffusionless transformation with double-c kinetics. Accurate modeling of the phase transformation requires detailed understanding of the role of plastic flow during the transformation and of the crystallographic transformation path. Using transmission electron microscopy (TEM), we find a significant increase in dislocation density in δ near the α′ plates, which suggests that plastic deformation contributes to the accommodation of the 20% reduction in volume during the transformation. Analysis of a series of optical micrographs of partially transformed alloys suggests that the α′ habit plane is usually nearly perpendicular to <111> δ. However, a small number of TEM observations support a habit plane near <112> or <123>, in agreement with earlier work.

Copyright

References

Hide All
1. Hecker, S. S., Los Alamos Science 26, 290 (2000).
2. Orme, J. T., Faiers, M. E., and Ward, B. J., in Plutonium and Other Actinides, edited by Blank, H. and Lindner, R. (North-Holland Publishing, Amsterdam, 1976), p. 761.
3. Wolfer, W. G., unpublished research, 2001.
4. Jin, Y. M., Wang, Y. U., and Khachaturyan, A. G., unpublished research, 2002.
5. Wang, Y. and Khachaturyan, A. G., Acta Mater. 45, 759 (1997).
6. Jin, Y. M., Artemev, A., and Khachaturyan, A. G., Acta Mater. 49, 2309 (2001).
7. Adler, P. H., Olson, G. B., and Margolies, D. S., Acta Metall. 34, 2053 (1986).
8. Zocco, T. G., Stevens, M. F., Adler, P. H., Sheldon, R. I., and Olson, G. B., Acta Metall. Mater. 38, 2275 (1990).
9. Wall, M. A., Schwartz, A. J., and Fluss, M. J., Lawrence Livermore National Laboratory Report No. UCRL-ID-141746 (2000).
10. Adler, P. H. and Olson, G. B., Metall. Trans. A 19, 2705 (1988).

Transformation Crystallography and Plasticity of the δ→α′ Transformation in Plutonium Alloys

  • C. R. Krenn (a1), M. A. Wall (a1) and A. J. Schwartz (a1)

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