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

Chao, Paul; Lindemann, George R.; Hunter, Allen H.; Shahani, Ashwin J.

doi:10.1016/j.actamat.2022.118335

Cited by 6 publications

(5 citation statements)

References 88 publications

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“…In the case of solidification studies, the small size of the dendrite tip with respect to the thickness of the sample means that the dendrite growth kinetic can be considered close to the three-dimensional case 60 , but the thin sheet shape of the sample induces confinement effects impacting the grain development, which is a limitation to the extension of the results to bulk configurations. Carrying out post-mortem analyses such as tomography and EBSD on a systematic basis can help contravene these limitation 25 , 61 .…”

Section: Discussionmentioning

confidence: 99%

In-situ X-ray monitoring of solidification and related processes of metal alloys

Reinhart,

Browne,

Kargl

et al. 2023

npj Microgravity

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X-ray radioscopy enables the in-situ monitoring of metal alloy processes and then gives access to crucial information on the dynamics of the underlying phenomena. In the last decade, the utilisation of this powerful imaging technique has been adapted to microgravity platforms such as sounding rockets and parabolic flights. The combination of microgravity experimentation with X-ray radioscopy has resulted in a leap in the understanding of fundamental science and has opened new paths in the fields of materials science. The present review focuses on the short history of this research, which includes facility developments, microgravity experiments and results obtained by partners of the XRMON (In-situ X-Ray MONitoring of advanced metallurgical processes under microgravity and terrestrial conditions) research project in the framework of the MAP (Microgravity Application Promotion) programme of the European Space Agency. Three illustrative research topics that were advanced significantly through the use of X-ray radioscopy will be detailed: solidification of metal alloys, metallic foam formation and diffusion in melts.

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Section: Discussionmentioning

confidence: 99%

In-situ X-ray monitoring of solidification and related processes of metal alloys

Reinhart,

Browne,

Kargl

et al. 2023

npj Microgravity

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show abstract

“…We summarize the experimental methods given already in Ref. [13]. As a proof-of-concept, we investigate samples of eutectic composition Al-33wt%Cu, cast via vacuum arc remelting at the Materials Preparation Centre at Ames National Laboratory (Ames, IA, USA).…”

Section: Methodsmentioning

confidence: 99%

“…Here, we circumvent this issue by developing a new method for real-time imaging, pseudo-4D X-ray tomography [13]. We apply this approach to investigate the evolution of microstructure inside eutectic colonies, with a focus on the morphological transitions between lamellae and rods.…”

Section: Introductionmentioning

confidence: 99%

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

Chao

Lindemann

Shahani

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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A number of fundamental questions remain unanswered regarding the interior structure of eutectic cells or colonies growing into a liquid. Here, we observe experimentally the solidification behaviour of an Al-Al2Cu eutectic as a model system using a novel imaging approach that combines in situ X-radiography and ex situ X-ray tomography. The former allows us to trace the solid-liquid interfaces while the latter enables us to visualize the solid-solid interfaces. When put together, we can visualize in 4D (i.e., three-dimensional space plus time) the development of a crystallographically ‘locked’ eutectic microstructure in the presence of an oscillatory eutectic-liquid velocity driven by thermosolutal convection. These details provide 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 morphological transition reflects a delicate balance between the motion of trijunctions and the stiffness of low-energy, solid-solid interfaces. Our pseudo-4D tomography approach holds broad appeal to the solidification science community, as it can temporally resolve the solidification process on the order of seconds and spatially resolves individual lamellae on the order of micrometres, thereby overcoming the space-time trade-off in conventional in situ X-ray tomography.

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Complexity and evolution of a three-phase eutectic during coarsening uncovered by 4D nano-imaging

Lindemann,

Chao,

Nikitin

et al. 2024

Acta Materialia

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

Cited by 6 publications

References 88 publications

In-situ X-ray monitoring of solidification and related processes of metal alloys

In-situ X-ray monitoring of solidification and related processes of metal alloys

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

Complexity and evolution of a three-phase eutectic during coarsening uncovered by 4D nano-imaging

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