Dislocation model of strain anisotropy

@article{Ungr2008DislocationMO,
  title={Dislocation model of strain anisotropy},
  author={Tam{\'a}s Ung{\'a}r},
  journal={Powder Diffraction},
  year={2008},
  volume={23},
  pages={125 - 132}
}
  • T. Ungár
  • Published 1 June 2008
  • Materials Science
  • Powder Diffraction
Dislocation model of strain anisotropy is presented. The dislocation theorem of strain broadening is suggested which means that strain broadening can only be caused by dislocation-type lattice defects. Based on this theorem strain anisotropy is modeled and accounted for by assuming that strain broadening is caused by dislocations or dislocation-type lattice defects. The effect of strain anisotropy is summarized in hkl dependent dislocation contrast factors, which can be either averaged over the… 

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References

SHOWING 1-10 OF 124 REFERENCES

Contrast factors of dislocations in the hexagonal crystal system

Strain anisotropy can be well accounted for by the dislocation model of lattice distortion. In a texture-free powder or polycrystal, or if all possible Burgers vectors are equally populated, the

The dislocation model of strain anisotropy in whole powder-pattern fitting: the case of an Li–Mn cubic spinel

Anisotropic strain broadening in X-ray or neutron powder diffraction can cause severe difficulties in whole powder-pattern fitting and Rietveld structure refinement. Several phenomenological models

The contrast factors of dislocations in cubic crystals: the dislocation model of strain anisotropy in practice

It has been shown recently that in many cases strain anisotropy in powder diffraction can be well accounted for by the dislocation model of the mean square strain. The practical application assumes

X‐ray diffraction line broadening due to dislocations in non‐cubic materials. II. The case of elastic anisotropy applied to hexagonal crystals

The calculation of orientation factors determining the anisotropy of dislocation-induced broadening of X-ray diffraction lines in crystals is treated for elastically anisotropic materials in terms of

The effect of dislocation contrast on X-Ray line profiles in untextured polycrystals

Anisotropic strain broadening in X-ray line profile analysis means that the width of diffraction profiles of Bragg reflections is not a monotonous function of the diffraction angle. The lack of a

X-ray diffraction line broadening due to dislocations in non-cubic crystalline materials. III. Experimental results for plastically deformed zirconium

Procedures of X-ray diffraction line profile analysis for the evaluation of the dislocation content in plastically deformed hexagonal materials were tested by means of conventional powder

Computer program ANIZC for the calculation of diffraction contrast factors of dislocations in elastically anisotropic cubic, hexagonal and trigonal crystals

The computer program ANIZC has been developed using the Pascal programming language for the calculation of diffraction contrast factors of dislocations in elastically anisotropic cubic, hexagonal and

Dislocation densities in soft and hard oriented grains of compression deformed textured NiAl polycrystals

Abstract NiAl polycrystals with different textures have been compressed at room temperature with and without confining pressure to strains of 6 and 30 %, respectively. Grain orientation dependent

X‐ray diffraction line broadening due to dislocations in non‐cubic materials. I. General considerations and the case of elastic isotropy applied to hexagonal crystals

Use is made of the theory of dislocation-induced X-ray diffraction line broadening in the form presented by Krivoglaz, Martynenko & Ryaboshapka [Fiz. Metall. Metalloved. (1983), 55, 5–171 to express
...