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WP5 at the midterm meeting András Borbély, ELTE

• What has been done
• Development of reconstruction software for the
  3DXRD method
• Indexing
• Refinement (low resolution reconstruction)
• High resolution reconstruction
• Application to a model structure
• Application to the real material (Al-0.5Mg)
• Software development for the evaluation of
  experimental data

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Deliverables

• Low and high resolution 3D-reconstruction of the
  initial state (M9).
• Ex situ and in situ deformation, evaluation of
  dislocation densities (M18).
• None of them could be produced!

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3DXRD microscopy

• E. M. Lauridsen, S. Schmidt, R. M. Suter and H.
  F. Poulsen, J. Appl. Cryst. (2001) 34.

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• Indexing
• Identification of Sensicam spots
• Reconstruction

(x,y)
Sensicam (1.3 ?m)
Frelon, low resolution detector (50 ?m)
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A measure for the goodness of reconstructed
parameters, output of indexing
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How large is the error of the experimental data?
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How large is the error of grain centers?
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Model structure, best possible reconstruction
(5?m)
y ?m
FOM 0.96
x ?m
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No additional error. Indexing based on Frelon
No additional error. Indexing based on Sensicam
FOM 0.92
FOM 0.7
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The influence of errors
? 1 pixel (Frelon)

• 1 pixel (Sensicam)

FOM 0.90
FOM 0.54
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Plan for the next 6 months

• Software development for high resolution peak
  identification
• New indexing software with high resolution data,
  considering all 5 parameters
• (2-position, 3-orientation)

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Deliverables to be produced

• Reconstruction of the 3D structure layer-by-layer
  (probably not easy, due to the absence of
  publications containing such reconstructions)
• Evolution of dislocation density in plane-strain
  compressed samples. Comparison between in situ
  and statistical evaluations. (Availability of
  ESRF for the in situ measurement)

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Problems with the experimental data
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Topo-tomographyan alternative method for the
nondeformed and recrystallized states, W. Ludwig
(INSA, ESRF)