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Instruments / Technical Area	Publication Details	Published	Actions
I12-JEEP: Joint Engineering, Environmental and Processing	4-D imaging of sub-second dynamics in pore-scale processes using real-time synchrotron X-ray tomography Katherine J. Dobson , Sophia B. Coban , Samuel A. Mcdonald , Joanna N. Walsh , Robert C. Atwood , Philip J. Withers Solid Earth 7, 1059 - 1073 DOI: 10.5194/se-7-1059-2016 Diamond Proposal Number(s): [10500] Open Access Show Abstract ▼ Abstract: A variable volume flow cell has been integrated with state-of-the-art ultra-high-speed synchrotron X-ray tomography imaging. The combination allows the first real-time (sub-second) capture of dynamic pore (micron)-scale fluid transport processes in 4-D (3-D + time). With 3-D data volumes acquired at up to 20 Hz, we perform in situ experiments that capture high-frequency pore-scale dynamics in 5–25 mm diameter samples with voxel (3-D equivalent of a pixel) resolutions of 2.5 to 3.8 µm. The data are free from motion artefacts and can be spatially registered or collected in the same orientation, making them suitable for detailed quantitative analysis of the dynamic fluid distribution pathways and processes. The methods presented here are capable of capturing a wide range of high-frequency nonequilibrium pore-scale processes including wetting, dilution, mixing, and reaction phenomena, without sacrificing significant spatial resolution. As well as fast streaming (continuous acquisition) at 20 Hz, they also allow larger-scale and longer-term experimental runs to be sampled intermittently at lower frequency (time-lapse imaging), benefiting from fast image acquisition rates to prevent motion blur in highly dynamic systems. This marks a major technical breakthrough for quantification of high-frequency pore-scale processes: processes that are critical for developing and validating more accurate multiscale flow models through spatially and temporally heterogeneous pore networks.	Jul 2016
I15-Extreme Conditions	Synchrotron analysis of toughness anomalies in nanostructured bainite Lucy Fielding , Nicholas Jones , J. Walsh , S. Van Boxel , M. Blackmur , P. D. Lee , P. Withers , H. Stone , H. K. D. H. Bhadeshia Acta Materialia 105, 52 - 58 DOI: 10.1016/j.actamat.2015.11.029 Diamond Proposal Number(s): [8564] Open Access Show Abstract ▼ Abstract: High-resolution synchrotron X-ray diffraction has been used to characterise the notch root regions of Charpy impact test specimens of a superbainitic steel, both before and after loading. The changes in the volume fraction of austenite induced by the application of a three-point-bending load were quantified. Analysis of diffraction peak shifts revealed the extent of residual tensile and compressive strains present due to both machining and an applied load. The results lend support to the hypothesis that the comparatively low energies absorbed during Charpy impact testing of superbainitic steels, <7 J, are due to the formation of stress-induced martensite at the notch root, prior to crack initiation.	Feb 2016

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