About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Materials Research in Reduced Gravity
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| Presentation Title |
Synchrotron x-ray nanotomography uncovers microstructure of a three-phase eutectic solidified in microgravity
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| Author(s) |
Soumyadeep Dasgupta, Melis Serefoglu, Ulrike Hecht, Xianghui Xiao, Ashwin Shahani |
| On-Site Speaker (Planned) |
Soumyadeep Dasgupta |
| Abstract Scope |
Microstructure selection of two-phase eutectics is reasonably well understood, but the same cannot be said about three-phase eutectics. Our study aims to advance fundamental understanding of pattern formation in the Al-Ag-Cu system during (near-) invariant eutectic solidification. To examine the microstructure selection under diffusive conditions, the material was directionally solidified in a microgravity environment aboard the International Space Station. We imposed a velocity jump during the solidification process to determine the spacing adjustment and pattern recovery mechanisms. Following solidification, we investigated the three-phase microstructure at high spatial resolution (~50 nm) via synchrotron based x-ray nanotomography. We quantified various attributes of the three-phase pattern before, during, and after the velocity jump. We find that the arrangement of solid phases is markedly different before and after the transition. Broadly, our research offers new insights into the selection of eutectic microstructures, with implications to a wide array of multi-phase systems. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Characterization, Solidification |