Accession Number:

AD0750712

Title:

Dislocation Damping in Single Crystals of Controlled Substructure.

Descriptive Note:

Final rept. 1 Sep 67-31 Aug 72,

Corporate Author:

NOTRE DAME UNIV IND DEPT OF METALLURGICAL ENGINEERING AND MATERIALS SCIENCE

Personal Author(s):

Report Date:

1972-10-01

Pagination or Media Count:

8.0

Abstract:

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

Subject Categories:

  • Metallurgy and Metallography
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE