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	Synchrotron X-ray imaging and ultrafast tomography in situ study of the fragmentation and growth dynamics of dendritic microstructures in solidification under ultrasound Zhiguo Zhang , Chuangnan Wang , Billy Koe , Christian M. Schlepütz , Sarah Irvine , Jiawei Mi Acta Materialia 8 DOI: 10.1016/j.actamat.2021.116796 Open Access Show Abstract ▼ Abstract: High speed synchrotron X-ray imaging and ultrafast tomography were used to study in situ and in real time the fragmentation and growth dynamics of dendritic microstructures of an Al-15%Cu alloy in solidification under ultrasound. Under the studied condition, a strong swirling acoustic flow of ∼0.3 m/s was observed, resulting in efficient dendrite fragmentation due to thermal perturbation remelting plus mechanical fracture and separation effects. Acoustic flow fatigue impact and phase collision effects were found to play a minor role in causing dendrite fragmentation. Just 10 s of ultrasound application at the early stage of solidification produced ∼100% more dendrite fragments compared to the case without ultrasound, resulting in 20∼25% reduction in the average grain size in the solidified samples. Furthermore, the dendrite morphology and tip growth velocity were mainly affected by the initial dendrite fragment number density and their distribution. The systematic and real-time datasets obtained in near operando conditions provided valuable 4D information for validation of numerical models and assistance in developing optimisation strategy for ultrasound melt processing in industry.	Mar 2021
I13-1-Coherence I13-2-Diamond Manchester Imaging	Multiscale characterization of the 3D network structure of metal carbides in a Ni superalloy by synchrotron X-ray microtomography and ptychography Zhiguo Zhang , Jia Chuan Khong , Billy Koe , Shifeng Luo , Shi Huang , Ling Qin , Silvia Cipiccia , Darren Batey , Andrew J. Bodey , Christoph Rau , Yu Lung Chiu , Zhu Zhang , Jean-christophe Gebelin , Nick Green , Jiawei Mi Scripta Materialia 193, 71 - 76 DOI: 10.1016/j.scriptamat.2020.10.032 Diamond Proposal Number(s): [9974, 13488, 22525] Open Access Show Abstract ▼ Abstract: Synchrotron X-ray microtomography and ptychography were used to characterize the 3D network structure, morphology and distribution of metal carbides in an as-cast IN713LC Ni superalloy. MC typed carbides were found to distribute mainly on the grain boundary between the matrix γ and γ' phase. The differences in solidification cooling rate had a minor influence on the volume fraction of the MC type carbides, but significantly affected the carbide size, distribution and network morphology. Depending on the local composition of the remaining liquid phase and geometric constraints, the carbides can form either spherical or strip or network morphologies. The research demonstrated clearly the advantage and technical potential of using the two complementary tomography techniques synergistically to characterize non-destructively complex multiple-phase structures in three dimensional space with a spatial resolution of ~30 nm.	Oct 2020

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