Accession Number : AD0290305

Title :   MECHANISM OF EVAPORATION OF METAL CRYSTALS

Corporate Author : METAL HYDRIDES INC BEVERLY MASS

Personal Author(s) : ROBINSON,W.H.

Report Date : 10 SEP 1962

Pagination or Media Count : 1

Abstract : This report includes: DISLOCATION CONFIGUATIONS IN DEFORMED SILVER SINGLE CRYSTALS, by H. J. Levinstein and W. H. Robinson. 1962.Ag single crystals oriented for single slip were deformed incrementally in both simple shear and tension, and the dislocation arrangements were observed after each increment of strain by optical examination of the etch pitted surface or by examining replicas of these surfaces by electron microscopy. in addition, some observations were made on specimens deformed in compression. For a given specimen several increments of strain were made during stage I of the deformation and also duing stage II. The principal facts which emerged from these observations are that stage I is characterized by slip bands consisting of clusters of dislocations which are cellular in appearance. The segments of these clusters which are straight are very short, probably no more than 1 microns, and a given portion of a dislocation moves only a short distance, of the order of 5 to 10 microns, before being stopped. These results agree with those of transmission electron microscopy of thin foils taken from bulk specimens which have been strained. But they do not agree with observations on thin foils strained in the electron microscope. (Author)

Descriptors :   *SILVER, *SINGLE CRYSTALS, COMPRESSIVE PROPERTIES, CRYSTAL DEFECTS, CRYSTAL LATTICES, CRYSTAL STRUCTURE, ELECTRON MICROSCOPY, EVAPORATION, METAL CRYSTALS, MICROSCOPY, OPTICAL ANALYSIS, SHEAR STRESSES, TENSILE PROPERTIES

Distribution Statement : APPROVED FOR PUBLIC RELEASE