X‐ray rocking‐curve broadening of tensile‐deformed [001]‐orientated copper single crystals

M. Wilkens, T. Ungár, H. Mughrabi

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X‐ray rocking curves of the Bragg reflexion g = {200} are measured on [001]‐orientated Cu single crystals deformed in tension at room temperature up to resolved shear stresses between 26.2 and 75.6 MPa. Forg= (200) and (020) the rocking‐curve half widths δβ(ϕ) (the azimuth ϕ denotes the state of rotation of the specimen around g) revealed a strong ϕ‐dependence, whereas for g = (002) the half width δβ(ϕ) is constant and is equal to the maximum of δβ(ϕ) in the case of g = (200) or (020), respectively. It is shown that this ϕ‐dependence of δβ and the fact that the tensile axis [001] remains remarkably stable under deformation can only be understood in terms of local violations of the fourfold symmetry of the slip geometry on a microscopic scale but pre‐ serving the fourfold symmetry on a macroscopic scale. Dislocation reaction models are presented by which the experimental data can be explained and which lead to the conclusion that the resolved shear strain in the eight slip systems with Schmid factor ≠ 0 may deviate locally from the average by not more than about 1%.

Original languageEnglish
Pages (from-to)157-170
Number of pages14
Journalphysica status solidi (a)
Issue number1
Publication statusPublished - 1987

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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