High Velocity Behavior of Dislocations in Copper
Final rept. 1 Oct 1972-31 Mar 1976
CALIFORNIA INST OF TECH PASADENA
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Dislocation velocity measurements were attempted using torsion pulses of 10 microsec duration to move dislocations at near-sonic velocities in copper single crystals. It was concluded that the torsion pulse technique was not applicable to the study of near sonic dislocation velocities in currently available test crystals. Efforts were then directed toward a the growth of more perfect copper with a considerably increased initial dislocation spacing, and b the development of a new loading system, designed to produce high amplitude stress pulses of shorter duration than obtainable with the torsion pulse technique about 5 microsec. The new loading system employs a giant laser pulse, and is briefly described in this report. The crystal growth system developed for the production of highly perfect copper crystals is also described, together with the results obtained to date on the perfection of the crystals grown with the new system.
- Metallurgy and Metallography