DIMENSIONAL INSTABILITY OF URANIUM--IV. Final Progress Report for July 1, 1958-March 31, 1959

Technical Report · Mon Feb 01 04:00:00 EST 1960

DOI:https://doi.org/10.2172/4168028· OSTI ID:4168028

Resnick, R.; Castleman, L. S.; Seigle, L.

Several experiments were performed in order to provide experimental basis for the diffusional theory of the dimensional instability of uranium. Alpha-uranium rods possessing a constant preferred orientation but varying grain size were irradiated in the MTR. Contrary to a prediction based on the theory, no significant effect of grain size on irradiation-induced growth could be detected. Also, the self-diffusion coefficient of alpha-uranium was measured as a function of crystallographic direction, since the theory is based on the anisotropic diffusion of vacancies. The average of two measurements made in each direction at 640 deg C are: D STA100 = 1.8 x 10/sup -14/ cm/sup 2/sec. D STA010! = 0.72 x 10/sup -14/ cm/sup 2/sec. D STA001! = 0.66 x 10/sup -14/ cm/sup 2/sec. The anisotropy is not nearly so large as bad been anticipated, and the above differences are within the experimental error. (auth)

• Research Organization: Sylvania Electric Products Inc. Research Labs., Bayside, N.Y.
• Sponsoring Organization: US Atomic Energy Commission (AEC)
• NSA Number: NSA-14-015063
• OSTI ID: 4168028
• Report Number(s): SEP-255
• Country of Publication: United States
• Language: English

Related Subjects

ALLOTROPY
ANISOTROPY
CONFIGURATION
CRYSTALS
DEFECTS
DIFFUSION
ERRORS
GRAIN SIZE
HIGH TEMPERATURE
IRRADIATION
LATTICES
MATERIALS TESTING
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
MTR
RESEARCH REACTORS
RODS
STABILITY
TESTING
URANIUM
URANIUM-ALPHA
VACANCIES
VARIATIONS