Swelling of Uranium and Uranium Alloys on Postirradiation Annealing PDF Download
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Author: B. A. Loomis
Publisher:
ISBN:
Category : Fuel burnup (Nuclear engineering).
Languages : en
Pages : 46
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Book Description
The swelling of uranium and of a few selected uranium alloys on post-irradiation annealing was investigated by utilizing density measurements in conjunction with the observation of pores in the microstructures of annealed specimens. Specimens were irradiated to about 0.3 at.% burnup in a constrained condition at approximately 275 deg C and were subsequently pulse annealed. The amount of swelling was found to be less than 1% for U specimens that were pulse annealed up to 75 hr at temperatures below 550 deg C; the amount of swelling, however, increased considerably on annealing at temperatures between 550 and 650 deg C. Specimens pulse annealed up to 75 hr at 618 deg C decreased in density by approximately 18%. The swelling was accompanied by the formation of bubbles on grain boundaries in recrystallized regions. The observations suggest that recrystallization is a necessary prerequisite for pronounced swelling in the alpha phase.
Author: B. A. Loomis
Publisher:
ISBN:
Category : Fuel burnup (Nuclear engineering).
Languages : en
Pages : 46
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Book Description
The swelling of uranium and of a few selected uranium alloys on post-irradiation annealing was investigated by utilizing density measurements in conjunction with the observation of pores in the microstructures of annealed specimens. Specimens were irradiated to about 0.3 at.% burnup in a constrained condition at approximately 275 deg C and were subsequently pulse annealed. The amount of swelling was found to be less than 1% for U specimens that were pulse annealed up to 75 hr at temperatures below 550 deg C; the amount of swelling, however, increased considerably on annealing at temperatures between 550 and 650 deg C. Specimens pulse annealed up to 75 hr at 618 deg C decreased in density by approximately 18%. The swelling was accompanied by the formation of bubbles on grain boundaries in recrystallized regions. The observations suggest that recrystallization is a necessary prerequisite for pronounced swelling in the alpha phase.
Author: A. Boltax
Publisher:
ISBN:
Category : Uranium
Languages : en
Pages : 80
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Author: T. K. Bierlein
Publisher:
ISBN:
Category : Annealing of metals
Languages : en
Pages : 40
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Book Description
Author: Gordon G. Bentle
Publisher:
ISBN:
Category : Nuclear fuel elements
Languages : en
Pages : 76
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: William V. Johnston
Publisher:
ISBN:
Category : Annealing of metals
Languages : en
Pages : 30
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Author: C. F. Reinke
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 46
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Irradiated specimens of 39 wt% U3O8 dispersed in aluminum and of aluminum-17.3 wt% uranium alloy were annealed. Each specimen was partially clad with aluminum.
Author: J. H. Kittel
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 42
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Book Description
Three separate irradiation experiments were completed with Th and Th-U alloys. In the first experiment, three-rolled plates of Th and Th-5 wt% U alloy irradiated to total atom burnups up to 1.5% at 200 deg C showed no anisotropic growth and decreased in density at a rate of 1% per wt.% burnup. In the second experiment, 15 swaged specimens of Th and of the alloys Th-0.1 wt% U, Th-1.4 wt% U, and Th-5.5 wt% U were irradiated to burnups ranging from 0.3 to 3.6% of all atoms at temperatures in the range of 45 to 200 deg C. Again, no anisotropic growth was observed and densities decreased at rates near 1% per wt.% burnup. A Th-1.4 wt% U alloy specimen with 2.0 wt.% burnup was found to have retained significant room-temperature ductility. In the final experiment, a group of 44 chill-cast specimens of Th alloys containing 10, 15, 20, 25, and 31 wt% U were irradiated to burnups ranging from 0.16 to 10.1% of all atoms. Maximum irradiation temperatures ranged from 260 to over 1000 deg C. Surface roughening occurred in the alloys containing 25 and 31 wt% U. Volume increases at any given temperature for all alloys were linear with increasing burnup. The rate of volume increase for all alloys rose from approximately 1% per wt.% burnup at the lower temperatures to a value of 2.5 at 650 deg C. Thereafter the swelling rate increased somewhat, reaching a value of 6% volume increase per wt.% burnup at 800 deg C. The rates of volume increase under irradiation of Th-U alloys in the entire temperature range studied were significantly less than those reported for the best U-base alloys. It is suggested that the excellent resistance to high- temperature swelling of the cast Th-U alloys resulted from the fact that a dispersion of very thin U particles was obtained. A high probability, therefore, existed for fission recoils to escape from the U particles into the isotropic and less densely packed Th matrix.
Author: A. A. Bauėr
Publisher:
ISBN:
Category : Nuclear fuel elements
Languages : en
Pages : 150
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Author:
Publisher:
ISBN:
Category : Artisans
Languages : en
Pages :
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