Collision cascades in pure δ-plutonium
- 100 Downloads
Molecular dynamics simulations of the formation and annealing of large collision cascades in delta-phase plutonium are presented. The defect evolution is followed with time up to 2 ns. Simulations are performed with the MEAM potential at three different temperatures; at 600 K where the pure delta phase is thermodynamically stable; at 300 K where the delta phase can only be maintained in a metastable state with minor additions of gallium or aluminum; and at 180 K where plutonium should transform to the alpha phase. It is found in all three cases that the atomic structure within the cascade evolves through a glass-like state. At 600 K, this structure recovers very slowly; at 300 K it persist up to 2 ns with no discernable trend to recover eventually; and at 180 K the amorphous structure initiated by the collision cascade spreads through the entire crystal and converts it to a glass-like structure.
KeywordsMolecular dynamics Radiation damage Plutonium
Unable to display preview. Download preview PDF.
- 1.Jacquemin, J., Lallement, R.: Length change of α, β and δ-Pu at 1.4 K and 4.2 K. In: Miner W. N. Proc. 4th Inter. Conf. on Plutonium and other Actinides. Met. Soc. AIME, N.Y., p. 617 (1970)Google Scholar
- 2.Marples, J.A.C., Hough, A., Mortimer, M.J., Smith, A., Lee, J.A.: Length changes in the actinide metals due to self-irradiation damage at 4 K. In: Miner, W.N. (ed.) Proc. 4th Inter. Conf. on Plutonium and other Actinides. Met. Soc. AIME, N.Y., p. 623. (1970)Google Scholar
- 3.Wolfer W.G. (2000). Los Alamos Science 26: 274 Google Scholar
- 4.Thompson, M.W.: Defects and Radiation Damage in Metals. Cambridge Univ. Press, chapter 6 (1969)Google Scholar
- 12.Averback R.S. and Diazdela Rubia T. (1998). Displacement damage in irradiated metals and semiconductors. Sol. State Phys. 51: 281 Google Scholar