Kategori: imaging

Kategorier
imaging synchrotrons

Experiments with metal foams at ESRF

Between 14th – 18th September, Indrajeet, Pär and Johan together with researchers from Lund and Ulm Universities went to Grenoble to conduct measurements at the European Synchrotron Radiation Facility (ESRF). The purpose of the visit was to investigate the microstructural evolution of metallic foams during heat treatment using an in-situ x-ray setup. This is part of Indrajeet’s PhD project, which is part of a joint Swedish-German project funded by the Swedish Research Council. The in-situ experiments were challenging, but the results look promising. Thus, we are confident that you will hear about the results at a conference in the near future.

Indrajeet holding the metal foam sample before loading it into the X-ray imaging instrument.
Close-up view of the sample, which is a small piece cut out from a block of metal foam.
View of the metal foam sample though the camera used for positioning in the X-ray instrument.
Kategorier
imaging

Neutron scattering experiments at JPARC

Johan was in Japan at the Takumi beamline of the Japan Proton Accelerator Research Complex (JPARC), performing residual stress measurements using time-of-flight neutron diffraction. The experiment is a part of an ongoing project together with Lund University, ESS, and Sandvik focused on investigating if/how neutrons can help with the characterization of cemented carbides for use in the mining industry. Bulk studies of these materials are not possible with x-rays because they contain a lot of Tungsten which is very x-ray absorbing. The high penetration power of neutrons is therefore needed to access the interior of the samples. Shirin Nouhi from Sandvik also joined the experiment.

Figure 1: The samples mounted on the diffractometer. The neutrons come from the small opening in the middle of the image, and diffracted neutrons are measured by the detectors to the left and right.
Figure 2: Neutron measurements are generally slow, which gave us plenty of time to sample some Japanese food.
Figure 3: Rietveld refinement on one of the diffractograms, showing peaks from tungsten-carbide and FCC-cobalt.
Kategorier
imaging

CeXS workshop on X-ray imaging and diffraction

Last week Johan gave an invited talk at the workshop “Combining X-ray imaging and diffraction for materials and biomedical characterisations” which was organized at KTH by the Center for X-rays in Swedish Materials Science (CeXS). The talk entitled “Grain-resolved diffraction: Investigating individual grains in polycrystalline samples” gave an overview of how imaging methods based on x-ray diffraction can be used to study the microstructure of a material and how it evolved during e.g. mechanical loading.

Kategorier
imaging synchrotrons

Surface diffraction imaging experiments at DanMAX

Johan and Indrajeet were at the MAX IV beamline DanMAX last week for an experiment using surface X-ray diffraction to map grains on polycrystalline surfaces. The new technique they are helping to develop is called “surface X-ray diffraction tomography”, and will enable surface structural characterization on complex samples under in situ conditions. The project is led by Johan Gustafson at Lund University.

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imaging

New PhD student: Welcome Indrajeet!

This week we welcomed Indrajeet Tambe, a new PhD student in the Applied Physics program. Before coming to Malmö, Indrajeet completed his master’s degree in Physics at the Indian Institute of Science Education and Research (IISER) Mohali. His PhD project involves the development of 3D X-ray imaging techniques for metal foams. The work is part of a larger project in collaboration with Lund University and the University of Ulm, financed through the Röntgen-Ångström Cluster (RÅC).

Indrajeet Tambe
Kategorier
imaging synchrotrons

Bragg CDI experiments at NanoMAX

Martin, Johan, Pär, and Mattias were at MAX IV last week performing measurements at the NanoMAX beamline. The goal of the experiment was to test the application of Bragg coherent diffraction imaging (CDI) to study precipitates in metal alloys.

3D map of a coherent Bragg reflection from a precipitate in an aluminum alloy