Principles of Highly Resolved Determination of Texture and Microstructure using High‐Energy Synchrotron Radiation

Abstract

Diffraction imaging with hard X‐rays (high‐energy synchrotron radiation) using the detector sweeping techniques allows measurement of the texture and microstructure of polycrystalline materials with high orientation‐ and location‐resolution. These techniques provide continuous two‐dimensional images of different sections and projections of the six‐dimensional “orientation‐location” space. For the high orientation resolution case, it is possible to measure the orientation and location coordinates of up to 105 individual grains simultaneously. From these parameters, the grain size and shape can also be obtained, yielding the complete orientation stereology of the polycrystalline aggregate, which is required for its complete characterization. For the high location resolution case, the intensity at any point of the diagrams corresponds to a pole density as a function of the orientation‐location space.

Crystal structure determination of incommensurate modulated martensite in Ni–Mn–In Heusler alloys

“…Thus, the preparation of stress-free sample is a prerequisite for correct determination of modulated structure. In addition, the existence of preferred crystallographic orientation has a significant impact on the intensity of reflections [57], affecting the relative intensity of different reflections. This effect is especially prominent for satellite reflections that bear the information of structural modulation.…”

Synchrotron Investigation on the Precipitation Behaviour of Niobium Microalloyed Steel

“…3 and Fig.4. The high-energy of the used synchrotronbeam allows inserting complicated sample environments, for instance vacuum furnaces or cryostats [8]. In order to understand the forming mechanism of precipitates, in-situ annealing experiments at the high-energy beam-line were carried out [9].…”

“…Niobium precipitates typically have diameters between < 2 and more than 30 nm. In addition, this technique enables in situ observation of the precipitation state as chemical composition, orientation and tilt towards the surrounding austenitic or ferritic matrix [8].…”

Calculation of anisotropic properties of dental enamel from synchrotron data

“…The texture measurements were carried out using the conventional step technique (Heidelbach et al, 1999;Wcislak et al, 2001Wcislak et al, , 2002Lonardelli et al, 2005;Klein, 2009). Diffraction images were taken at the orientation angle !…”

“…In order to understand the physical behaviour of a polycrystalline biomaterial, examination methods of technological materials can be used. In recent years diffraction techniques using high-energy synchrotron radiation has become more and more important for material sciences because of their excellent properties such as high angular and local resolving power, high brilliance and high penetration depth (Heidelbach et al, 1999;Wcislak et al, 2001Wcislak et al, , 2002Lonardelli et al, 2005;Klein, 2009). The investigations described here were carried out using the multi-purpose diffraction device at beamline BW5 at HASYLAB/DESY in Hamburg, Germany.…”