Visualizing the heterogeneous breakdown of a fractal microstructure during compaction by neutron dark-field imaging.

Autor: Harti RP; Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Zurich, Switzerland., Valsecchi J; Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Zurich, Switzerland., Trtik P; Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Zurich, Switzerland., Mannes D; Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Zurich, Switzerland., Carminati C; Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Zurich, Switzerland., Strobl M; Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Zurich, Switzerland.; Niels Bohr Institute, Copenhagen, Denmark., Plomp J; Reactor Institute Delft, TU Delft, Delft, Netherlands., Duif CP; Reactor Institute Delft, TU Delft, Delft, Netherlands., Grünzweig C; Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Zurich, Switzerland. christian.gruenzweig@psi.ch.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2018 Dec 14; Vol. 8 (1), pp. 17845. Date of Electronic Publication: 2018 Dec 14.
DOI: 10.1038/s41598-018-35845-y
Abstrakt: Structural properties of cohesive powders are dominated by their microstructural composition. Powders with a fractal microstructure show particularly interesting properties during compaction where a microstructural transition and a fractal breakdown happen before compaction and force transport. The study of this phenomenon has been challenging due to its long-range effect and the subsequent necessity to characterize these microstructural changes on a macroscopic scale. For the detailed investigation of the complex nature of powder compaction for various densification states along with the heterogeneous breakdown of the fractal microstructure we applied neutron dark-field imaging in combination with a variety of supporting techniques with various spatial resolutions, field-of-views and information depths. We used scanning electron microscopy to image the surface microstructure in a small field-of-view and X-ray tomography to image density variations in 3D with lower spatial resolution. Non-local spin-echo small-angle neutron scattering results are used to evaluate fitting models later used as input parameters for the neutron dark-field imaging data analysis. Finally, neutron dark-field imaging results in combination with supporting measurements using scanning electron microscopy, X-ray tomography and spin-echo small angle scattering allowed us to comprehensively study the heterogeneous transition from a fractal to a homogeneous microstructure of a cohesive powder in a quantitative manner.
Databáze: MEDLINE
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