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  Zabler, S.; Rack, A.; García-Moreno, F.; Ershov, A.; Baumbach, T.; Banhart,J.: Imaging fast processes in liquid metal foams and semi-solid alloys using synchrotron radioscopy with spatio-temporal micro-resolution. In: Kannengiesser, T. [u.a.] [Eds.] : In-situ studies with photons, neutrons and electrons scatteringBerlin: Springer, 2010. - ISBN 978-3-642-14793-7, p. 149-158

Abstract:
New x-ray sources of unmatched brilliance, like the superconducting undulator device at ESRF high-energy beamline ID15A, allow for micro-radioscopic investigations with time-resolution up to the micro-second range. Here we present first results of two recent in-situ experiments: the visualization of semi-solid metal flow at an acquisition speed 500 frames/second (fps) and the collapse of pore walls in liquid metallic foams investigated at 40 000 fps. Both applications reveal important qualitative and quantitative facts about the dynamic processes in liquid and/ or semi-solid metals which were inaccessible until now because of either the limited spatial and / or the limited time-resolution of conventional x-ray devices. Thus, semi-solid slurry is observed to break into small particle clusters when injected at high speed. The event of cell wall collapse in metal foams is found to take ~1-2 ms time, indicating that the dynamics of this system is inertia controlled.