Mobility of Fast-Moving Second-Order Pyramidal Dislocations in Zinc at 77 deg K and 296 deg K
Interim rept. 1 Oct 1972-30 Sep 1974
CALIFORNIA INST OF TECH PASADENA W M KECK LAB OF ENGINEERING MATERIALS
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Slip bands were produced by compression stress pulses at 77 deg K and 296 deg K and observed by X-ray reflection topography. Viscous behavior of edge, screw, and mixed dislocations was observed at velocities in the range 1000 cm sec to about 80,000 cmsec. The drag coefficient for second-order pyramidal dislocations was calculated from the measurements. The results indicate that phonon drag limits the dislocation velocity in these experiments.
- Metallurgy and Metallography
- Solid State Physics