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Evolution of Static Physical Properties in Plutonium by Self-irradiation Damage

  • Brandon W Chung (a1), Kenneth Lema (a2) and David Hiromoto (a3)

Abstract

The alpha-decay of plutonium leads to the age-related change in physical properties. This paper presents updated results of age-related effects on enriched and reference alloys measured from immersion density, dilatometry, and mechanical tests. After nearly 100 equivalent years of aging, both the immersion density and dilatometry show that the enriched alloys are decreasing in density by less than 0.002% per year and now exhibit a near linear density decrease, without void swelling. The tensile tests show that the aging process increases the strength of plutonium alloys, followed by possible saturation past 70 equivalent years of age. The ultimate goal of this work is to develop capabilities to predict physical properties changed by aging effects.

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References

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1 Wolfer, W. G., “Radiation effects in plutonium. What is known? Where should we go from here,” in Los Alamos Science, eds. Cooper, N. G., (Los Alamos National Laboratory: Los Alamos, 2000, v26) pp 274285.
2 Hecker, S. S. and Martz, J. C., “Aging of Plutonium and its alloys,” in Los Alamos Science, eds. Cooper, N. G., (Los Alamos National Laboratory: Los Alamos, 2000, v26) pp 238243.
3 Chung, B. W., Thompson, S. R., Woods, C. H., Hopkins, D. J., Gourdin, W. H., and Ebbinghaus, B. B., J. Nucl. Mater., 335 142149 (2006).
4 Bowen, H. A. and Schoonover, R. M., J. of Res. Nat. Bur. Stand. – C, 71C [3] 179198 (1967).

Keywords

Evolution of Static Physical Properties in Plutonium by Self-irradiation Damage

  • Brandon W Chung (a1), Kenneth Lema (a2) and David Hiromoto (a3)

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