Hostname: page-component-8448b6f56d-sxzjt Total loading time: 0 Render date: 2024-04-20T08:50:31.181Z Has data issue: false hasContentIssue false

Combined micro-beam Laue and white beam topography: mapping local lattice orientation and misorientation

Published online by Cambridge University Press:  01 November 2010

F. Hofmann
Affiliation:
Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
A. M. Korsunsky*
Affiliation:
Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
B. Abbey
Affiliation:
Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
I. Dolbnya
Affiliation:
Diamond Light Source, Didcot OX11 0DE, UK
M. Xie
Affiliation:
Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
X. Song
Affiliation:
Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
*
Email address for correspondence:alexander.korsunsky@eng.ox.ac.uk
Get access

Abstract

Micro-beam Laue diffraction is a well-established technique to determine lattice orientation and lattice structure. A polychromatic X-ray beam is used to illuminate a scattering volume within individual crystallites. The resulting diffraction pattern consists of a number of Laue spots. By refinement of the exact spot positions, lattice orientation and deviatoric elastic strain of the single crystalline scattering volume can be determined. Diffraction spot shape is linked to the orientation spread in the scattering volume arising due to the local dislocation structure. However, angular resolution of Laue diffraction spots is limited due to small sample-to-detector distance (~100 mm) and large Laue camera pixel size (~40 µm). In contrast, X-ray diffraction topography allows high-resolution imaging of an individual reflection from a crystal. On beamline B16 at the Diamond Light Source, we have combined micro-beam Laue diffraction with simultaneous collection of diffraction topographs, using a second high-resolution X-ray camera in the far field. In situ deformation of a single grain within a thin Ni foil has been studied using this setup. While detailed analysis is ongoing, some early results are presented here to allow an assessment of the technique's utility and future development possibilities.

Type
Poster paper
Copyright
Copyright © Diamond Light Source Ltd 2010

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Gaucherin, G., Hofmann, F., Belnoue, J. P. & Korsunsky, A.M. 2009 Crystal plasticity and hardening: a dislocation dynamics study. Procedia Engng 1, 241244.CrossRefGoogle Scholar
Hofmann, F., Abbey, B., Song, X., Dolbnya, I. & Korsunsky, A. M. 2010 Intragranular lattice misorientation mapping by synchrotron X-ray micro-beams: Laue vs energy-resolved Laue vs monochromatic reciprocal space analysis. Intl J. Mod. Phys. B 24, 279287.CrossRefGoogle Scholar
Hofmann, F., Song, X., Eve, S., Collins, S. R. & Korsunsky, A. M. 2009 Synchrotron based reciprocal space mapping and dislocation substructure analysis. Mater. Lett. 63, 10771081.CrossRefGoogle Scholar
Song, X., Zhang, S.Y. & Korsunsky, A. M. 2010 Strain gradient polycrystal plasticity analysis: FE modeling and synchrotron X-ray diffraction. Intl J. Mod. Phys. B 24, 1017.CrossRefGoogle Scholar
Salimon, A. I., Korsunsky, A. M. & Ivanov, A. N. 1999 The character of dislocation structure evolution in nanocrystalline FCC Ni-Co alloys prepared by high-energy mechanical milling. Matls Sci. Engng A 271, 196205.CrossRefGoogle Scholar