Dislocation Damping in Single Crystals of Controlled Substructure.
Final rept. 1 Sep 67-31 Aug 72,
NOTRE DAME UNIV IND DEPT OF METALLURGICAL ENGINEERING AND MATERIALS SCIENCE
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Techniques have been developed for reproducibly growing Cu single crystals of controlled dislocation cell size and controlled random dislocation density. The ultrasonic pulse-echo attenuation of the crystals of various substructure has been measured from 2 to 100 MHz. The resonance bar damping of the crystals has been measured from 2 to 250 kHz. The damping and attenuation have been found to strong functions of substructure, and the vibrating membrane modification of the Granato-Lucke theory of dislocation damping has been proposed to explain the relationship. Author
- Metallurgy and Metallography
- Solid State Physics