Real-time visualization of particle evolution during reactive flux-assisted processing of aluminum melts

Reese, Caleb; Gladstein, Aaron; Shevchenko, Pavel; Xiao, Xianghui; Shahani, Ashwin J.; Taub, Alan

doi:10.1016/j.scriptamat.2021.113978

Cited by 4 publications

(1 citation statement)

References 62 publications

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“…We conducted our experiments at sector 2-BM of Argonne National Laboratory's Advanced Photon Source. The synchrotron beamline is equipped with a resistive furnace, described elsewhere [59,60,61,62,63,64]. We calibrated the temperature at the sample position with a thermocouple prior to the experiment.…”

Section: Methodsmentioning

confidence: 99%

Pseudo-4D view of the growth and form of locked eutectic colonies

Chao,

Lindemann,

Shahani

2022

Preprint

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We investigate solidification of an Al-Al 2 Cu as a model system to understand the emergence of patterns (such as lamellar, rod and maze-like) within eutectic colonies. To uncover the morphological transitions in-situ and in 3D, we introduce here a new synchrotron-based, X-ray imaging procedure. Our method simultaneously maximizes the temporal (200 ms) and spatial resolution (0.69 2 µm 2 /pixel) over that of traditional imaging approaches. The wealth of information obtained from this procedure enables us to visualize the development of a crystallographically 'locked' eutectic microstructure in the presence of thermosolutal convection. This data provides direct insight into the mechanism of the lamella-to-rod transition as the eutectic accommodates fluctuations in interfacial composition and growth velocity. We find that this transition is brought about by impurity-driven forces acting on the solid-solid-liquid trijunction that must overcome the stiffness of the solid-solid interfaces.Our pseudo-4D imaging strategy holds broad appeal to the solidification science community, as it can overcome the space-time trade-off in conventional in situ X-ray microtomography.

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