GRAIN SIZE MEASUREMENTS IN URANIUM BY USE OF ULTRASONICS
Ultrasonic attenuation and velocity measurements were made on polycrystalline U specimens of varying grain size. The major contribution to the attenuation is shown to be the result of a scattering mechanism created by the anisotropic grain orientation. It is also shown that this attenuation is very sensitive to small changes in grain diameter and thus can be used as a quantitative nondestructive measurement of grain size. The attenuation as a function of average grain diameter can be expressed by the equation a = Ae/sup kD/ , where a - the attenuation in db/ mu sec, A = a frequency-dependent constant, k = 1.17 x 10/sup 3/ db/ mu sec-inch, and D = the average grain diameter in in. A description of the specimens, mechanical fixturing, and electronic instrumentation for making these measurements is given. Some basic theory on the attenuation of sound in solids is also included. (auth)
- Research Organization:
- California. Univ., Livermore. Lawrence Radiation Lab.
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-17-018776
- OSTI ID:
- 4739850
- Report Number(s):
- UCRL-6984
- Country of Publication:
- United States
- Language:
- English
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