Dislocation structure and crystallite size distribution in plastically deformed metals determined by diffraction profile analysis

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Abstract

The dislocation densities and arrangement parameters and the crystallite size and size-distributions are determined in tensile or cyclically deformed polycrystalline copper specimens by X-ray diffraction peak profile analysis. The Fourier coefficients of profiles measured by a special high resolution X-ray diffractometer with negligible instrumental broadening have been fitted by the Fourier transforms of ab-initio size and strain profiles. It is found that in the fatigued samples the dislocations are mainly of edge type with strong dipole character. In the fatigued specimens the dislocation densities are found to be larger than in the tensile deformed samples when the saturation and flow stress levels are the same.

Original languageEnglish
Pages (from-to)2-6
Number of pages5
JournalJournal of Engineering Materials and Technology, Transactions of the ASME
Volume124
Issue number1
DOIs
Publication statusPublished - Jan 2002

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Diffractometers
Crystallite size
Plastic flow
Copper
Fourier transforms
Diffraction
Metals
X ray diffraction
X rays
profiles
diffraction
metals
diffractometers
x rays
dipoles
saturation
copper
high resolution
coefficients

ASJC Scopus subject areas

  • Mechanical Engineering
  • Materials Science(all)

Cite this

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AU - Ungár, T.

AU - Ribárik, G.

AU - Gubicza, J.

AU - Hanák, P.

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AB - The dislocation densities and arrangement parameters and the crystallite size and size-distributions are determined in tensile or cyclically deformed polycrystalline copper specimens by X-ray diffraction peak profile analysis. The Fourier coefficients of profiles measured by a special high resolution X-ray diffractometer with negligible instrumental broadening have been fitted by the Fourier transforms of ab-initio size and strain profiles. It is found that in the fatigued samples the dislocations are mainly of edge type with strong dipole character. In the fatigued specimens the dislocation densities are found to be larger than in the tensile deformed samples when the saturation and flow stress levels are the same.

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