Accession Number : AD0282054

Title :   THE EFFECT OF COLD-WORK ON THE X-RAY DIFFRACTION PATTERN COPPER-SILICON- MANGANESE ALLOY,

Corporate Author : MARTIN CO BALTIMORE MD RESEARCH INST FOR ADVANCED STUDIES

Personal Author(s) : Welch ,David O. ; Otte,Henry M.

Report Date : JUN 1962

Pagination or Media Count : 63

Abstract : Plastic deformation of metals produces a state characterized by the presence of resudual elastic strains, small domains which diffract x-rays coherently, and often stacking faults; these effects may be studied with x-ray diffraction techniques. Changes in the lattice parameter, shifts in the relative positions of diffraction lines, and the broadening of diffraction lines were used to study the state of cold-work resulting in Cu-6.6 at -% Si-1.2 at -% Mn after deformation by filing, wire drawing, and uniaxial tension at room temperature. Both filing and wire drawing produced large root-mean-square strains and stacking faults, whereas deformation by tension up to 22% extension failed to produce any clear evidence of faulting or root-mean-square strains. Tensile deformation caused fragmentation of coherent domains to an average dimension of 250 A after 22% extension, and results in a radial, tensile, resudual macrostrain arising from a smaller rate of work hardening in the surface layers than in the interior. Wire drawing also resulted in a residual macrostrain system. (Author)

Descriptors :   *COPPER ALLOYS, *SILICON ALLOYS, *MANGANESE ALLOYS, *X RAY DIFFRACTION, METAL CRYSTALS, ALLOYS, LATTICES, ELASTIC PROPERTIES, STRESSES, DRAWING (MACHINE PROCESSING), TENSILE PROPERTIES, MECHANICAL PROPERTIES, MICROSTRUCTURE, DIFFUSION, DEFORMATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE