Accession Number : AD0465538

Title :   CORRELATION OF OPTICAL AND ELECTRON-OPTICAL OBSERVATIONS IN TORSION FATIGUE OF BRASS.

Descriptive Note : Technical rept.,

Corporate Author : COLUMBIA UNIV NEW YORK INST FOR THE STUDY OF FATIGUE AND RELIABILITY

Personal Author(s) : Grosskreutz, J. C. ; Reimann, W. H. ; Wood, W. A.

Report Date : APR 1965

Pagination or Media Count : 24

Abstract : Optical micrographs of etched sections of torsion fatigued brass are compared with transmission electron micrographs of foils prepared from comparable specimens. In this way it was possible to elucidate the microstructural changes produced by fatique and shown by optical microscopy by viewing them also at the high resolution of the electron microscope. Dispersed slip of what has been termed the S fatigue range in optical studies corresponded with dispersed 9 x 10 to the 8th power/sq cm. Concentrated slip in what has been termed the F range corresponded with concentrations of dislocations, loops, and debris. Cell formations in what has been termed the H range corresponded with cellular dislocation distributions. (Author)

Descriptors :   (*BRASS, FATIGUE(MECHANICS)), TORQUE, ETCHED CRYSTALS, MICROSCOPY, ELECTRON MICROSCOPY, CRYSTAL DEFECTS, FOILS(MATERIALS).

Distribution Statement : APPROVED FOR PUBLIC RELEASE