Time-resolved in situ tomography for the analysis of evolving metal-foam granulates

Abstract

An experimental setup has been developed that allows for capturing up to 25 tomograms s using the white X-ray beam at the experimental station EDDI of BESSY II, Berlin, Germany. The key points are the use of a newly developed, precise and fast rotation stage, a very efficient scintillator and a fast CMOS camera. As a first application, the foaming of aluminium alloy granules at 923 K was investigated in situ. Formation and growth of bubbles in the liquid material were observed and found to be influenced by the limited thermal conductivity in the bulk granules. Changes that took place between two tomographic frames separated in time by 39 ms could be detected and analysed quantitatively.

Using X-ray tomoscopy to explore the dynamics of foaming metal

“…Tomography naturally has been much slower than radioscopy but some proofs of concept on solid samples have shown that acquisition rates of 100 tps are feasible 48 . The state of the art in fast and high-resolution tomographic microscopy (we consider here voxel sizes smaller than 10 µm) applied to dynamically evolving materials is 20−25 tps 40,45,49 . This work is showing an increase of this parameter to 208 tps while maintaining other features such as field of view, spatial resolution and period of continuous acquisition.…”

“…1Image acquisition rates and times used to study metal foams. The highest image acquisition rates in each year achieved for 2D radioscopic (blue, in s −1 , fps) 13,14,58–61 and 3D tomoscopic (red, in s −1 , tps) 35,44,45,62 analyses of evolving liquid metal foams are given. The horizontal broken lines delimit the image acquisition rate ranges required for the study of the phenomena named in the boxes highlighted in green.…”

Visualizing the morphological and compositional evolution of the interface of InLi-anode|thio-LISION electrolyte in an all-solid-state Li–S cell by in operando synchrotron X-ray tomography and energy dispersive diffraction

“…2A, and 3A and 2C, 3C, and D, respectively. It has to be pointed out that due to the high X-ray absorption of In/InLi, the white beam at the employed EDDI beamline 30,31 cannot fully penetrate the 3 mm diameter In/InLi. Only the relatively thinner part, i.e., the protuberant or convex region, can be measured and analyzed (see the results below).…”

Simultaneous X-ray radioscopy/tomography and energy-dispersive diffraction applied to liquid aluminium alloy foams

“…Full diffraction patterns were recorded with a repetition rate up to 2 Hz. Further details of the setup were described previously (García-Moreno et al, 2013, 2018. The transmitted beam is converted into visible light by a 200 mm-thick LuAG:Ce scin-tillator.…”