Speaker
Description
The I12-JEEP beamline as a part of the national UK synchrotron facility Diamond Light Source (DLS) represents a versatile instrument combining high-energy ($53 – 150$ keV) X-ray scattering and imaging techniques used in the structural characterization of metallic and non-metallic materials, chemical products, geological, biological, archaeological, and palaeontological samples [1, 2]. The extremely high intensity of synchrotron radiation compared to laboratory X-ray sources allows the realisation of in-situ and operando measurements and observations of processes easily with sub-second and millisecond resolution.
Several study examples would be present to envisage that magnetic properties and magnetic interactions can be examined and interpreted indirectly through tools of synchrotron-based X-ray diffraction/total scattering and fast X-ray imaging.
For example, the anomalous thermal expansion known as the Invar effect observed in ferromagnetic Fe-based metallic represents a challenge in our understanding of its manifestation at the atomic scale. It is generally accepted that a high-energy X-ray diffraction (HEXRD) is a critical and indispensable technique to characterise a short-range ordering in metallic glasses and offer an opportunity to link macroscopic material features with atomic structure at the atomic level [3]. In situ HEXRD was able to elucidate the Invar effect in Fe-based metallic glasses at the atomic scale. It was proved that the macroscopic effect has a clear atomistic equivalent in the average Fe-Fe pair distance [4]. Another example underlines the cruciality of better understanding of microstructure formation during casting to welding processes which can be modified by applying an external magnetic field. To follow the formation of precipitates and influence of the magnetic field, high speed synchrotron X-ray imaging/tomography shall be employed [5, 6].
References
[1] M. Drakopoulos et al., “I12: the Joint Engineering, Environment and Processing (JEEP) beamline at Diamond Light Source,” Journal of Synchrotron Radiation, vol. 22, no. 3. International Union of Crystallography (IUCr), pp. 828–838, Apr. 08, 2015. https://doi.org/10.1107/s1600577515003513
[2] https://www.diamond.ac.uk/Instruments/Imaging-and-Microscopy/I12.html
[3] C. J. Benmore, “A Review of High-Energy X-Ray Diffraction from Glasses and Liquids,” ISRN Materials Science, vol. 2012. Hindawi Limited, pp. 1–19, Nov. 14, 2012. https://doi.org/10.5402/2012/852905
[4] A. Firlus et al., “Atomic structure evolution related to the Invar effect in Fe-based bulk metallic glasses,” Nature Communications, vol. 13, no. 1. Springer Science and Business Media LLC, Feb. 28, 2022. https://doi.org/10.1038/s41467-022-28650-9
[5] Z. Song et al., “Revealing growth mechanisms of faceted Al2Cu intermetallic compounds via high-speed Synchrotron X-ray tomography,” Acta Materialia, vol. 231. Elsevier BV, p. 117903, Jun. 2022. https://doi.org/10.1016/j.actamat.2022.117903
[6] J. Wang et al., “Refinement and growth enhancement of Al2Cu phase during magnetic field assisting directional solidification of hypereutectic Al-Cu alloy,” Scientific Reports, vol. 6, no. 1. Springer Science and Business Media LLC, Apr. 19, 2016. https://doi.org/10.1038/srep24585
