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Materials science diffractometer
In response to the development of new materials and the application of materials and components in new technologies the direct measurement, calculation and evaluation of textures and residual stresses has gained worldwide significance in recent years.
STRESS-SPEC, the materials science diffractometer is located at the thermal beam port SR-3 of the FRM II and can easily be configured either for texture analysis or strain measurements.
The set-up utilises three different monochromators: Ge (511), bent silicon Si (400) and pyrolitic graphite PG(002). This selection of monochromators and the possibility to vary automatically the take-off angles from 2θM = 35º to 110º allows to find a good compromise between resolution and intensity for each measuring problem.
The gauge volume defining optical system of primary and secondary slits is designed with regard to reproducibility of geometrical alignment and sturdiness. Both slit systems are linked to the sample table and the detector in such a way that the center of the beam remains the same under all conditions. Instead of the secondary slit a radial collimator can be used in front of the detector. Samples can be aligned using theodolites and a camera system. In addition the possibility to scan surfaces of components offline using a CMM laser scanner is available at STRESS-SPEC.
 Hofmann, M. et al., Physica B, 385‑386, 1035‑1037 (2006).
 Saroun, J. et al., J. Appl. Cryst., 46, 628‑638 (2013).
 Brokmeier, H.-G. et al., Nucl. Instr. Meth. A, 642, 1, 87‑92 (2011).
A positioning system consisting of a Stäubli-6-axes robotic arm for texture and strain measurements (payload up to 30 kg) can be mounted instead of the standard sample table. It offers more flexibility than an Eulerian cradle and can be also used as automatic sample changer for texture measurements .
 Randau, C. et al., Nucl. Instr. Meth. A, 794, 67–75 (2015).
DISEMM (Diffraction assisted mechanical modeling)
The software DISEMM is designed to analyze diffraction data from in-situ loading experiments to obtain diffraction elastic constants and single-crystal elastic constants as well as to describe the mechanical behavior by the elasto-plastic self –consistent modeling.
DISEMM offers a variety of grain-to-grain interaction models, integrates texture and multi-phase alloys.
Heldmann et al. (2019), Journal of applied crystallography
The software is currently available for Windows.
The download provided here provides a .zip file consisting of libraries and the executable, just unpack and you are ready. The DISEMM software code can be found on github, you can get the corresponding manual here.
Dr. Michael Hofmann
Phone: +49 (0)89 289-14744
Dr. Joana Rebelo Kornmeier
Phone: +49 (0)89 289-14710
Dr. Weimin Gan
Phone: +49 (0)89 158860-766
Phone: +49 (0)89 158860-554
Find the latest publications regarding STRESS-SPEC in our publication database iMPULSE:
Heinz Maier-Leibnitz Zentrum. (2015). STRESS-SPEC: Materials science diffractometer. Journal of large-scale research facilities, 1, A6. http://dx.doi.org/10.17815/jlsrf-1-25
For citation please always include the DOI.