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RESEARCH IN THE GENERAL FIELD OF SUBSTRUCTURE AND DISLOCATION NETWORKS IN METALLIC CRYSTALS.
Final rept. for 1 Apr 60-30 Apr 62,
FRANKLIN INST PHILADELPHIA PA LABS FOR RESEARCH AND DEVELOPMENT
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The three dimensional aspects of dislocation substructures were studied in cadmium doped zinc crystals grown from the melt. Precipitates delineating the dis locations were revealed by etching a surface closely parallel to the slip plane. Using a technique of continuous etching and cinephotomicrography, the course of the dislocations was followed through the crystal. Tangles of dislocations were observed in deformed crystals. After annealing a rearrangement of dislocations into low-angle and hexagonal networks was evidenced. Closed loops and spiral dislocations were found to be associated with large inclusions. A mechanism for the multiplication of dislocations at inclusions was proposed. Dislocation reactions accounting for the observed substructures have been proposed. Author
APPROVED FOR PUBLIC RELEASE