Accession Number : AD0610434

Title :   RESEARCH IN THE GENERAL FIELD OF SUBSTRUCTURE AND DISLOCATION NETWORKS IN METALLIC CRYSTALS.

Descriptive Note : Final rept. for 1 Apr 60-30 Apr 62,

Corporate Author : FRANKLIN INST PHILADELPHIA PA LABS FOR RESEARCH AND DEVELOPMENT

Personal Author(s) : Damiano,V. V. ; Tint,G. S. ; Herman,M.

Report Date : 30 APR 1962

Pagination or Media Count : 48

Abstract : 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)

Descriptors :   (*METAL CRYSTALS, CRYSTAL STRUCTURE), (*CRYSTAL STRUCTURE, METAL CRYSTALS), CRYSTAL SUBSTRUCTURE, CRYSTAL DEFECTS, CRYSTALS, ZINC, IMPURITIES, CADMIUM, CHEMICAL MILLING, PHOTOMICROGRAPHY, CRYSTALLOGRAPHY

Distribution Statement : APPROVED FOR PUBLIC RELEASE