THE INFLUENCE OF FINELY DISPERSED PRECIPITATES ON FISSION GAS BUBBLE FORMATION IN URANIUM-MOLYBDENUM TERNARY ALLOYS
Technical Report
·
OSTI ID:4153000
An irradiation experiment was conducted to test the effectiveness of finely dispersed phases in reducing swelling. U--4% Mo--0.1% Si and U--10% Mo-- 0.04% Sn alloys containing finely dispersed phases were irradiated with appropriate control samples at low temperatures, then postirradiation annealed to induce swelling. The annealing was performed in steps at progressively higher temperatures from 550 to 950 deg C with density measurements taken after each step and electron microscope examinations when warranted. The lowest density changes took place in samples having the finest dispersions, 10/sup 12/ to 10/sup 13/ particles per cm/sup 3/. Binary control samples having no dispersions experienced density decreases more than ten times that of equivalent samples with dispersions. After a 750 deg C anneal, a U--4% Mo--0.1% Si alloy with a fine dispersion having experienced a 0.4 at.% burnup showed only a 1.7% density decrease. A U-- 10% Mo-0.04% Sn alloy showed the same density decrease after an 850 deg C anneal following a burnup of 0.6 at.%. Irradiation-induced precipitation was observed in the U--4% Mo--0.1% Si alloy and is believed to have occurred in the U-- 10% Mo-0.04% Sn alloy producing a particle density on the order of 10/sup 14/ per cm/sup 3/. The greatly improved swelling resistance of the samples with fine dispersions results from the interaction of gas atoms with the original precipitates and with the radioinduced precipitates. These precipitates, acting as trapping sites for gas bubbles, stabilized the fission gas in an array of a large number of small bubbles thereby reducing the swelling. (auth)
- Research Organization:
- North American Aviation, Inc. Science Center, Canoga Park, Calif.
- DOE Contract Number:
- AT(11-1)-GEN-8
- NSA Number:
- NSA-18-005814
- OSTI ID:
- 4153000
- Report Number(s):
- CONF-331-2
- Country of Publication:
- United States
- Language:
- English
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