About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Frontiers in Solidification: An MPMD Symposium Honoring Jonathan A. Dantzig
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Presentation Title |
The Impact of Melt Flow on Solidification Patterns in a Ternary Ga-In-Bi Alloy |
Author(s) |
Natalia Shevchenko, Olga Budenkova, Guy Chichignoud, Sven Eckert |
On-Site Speaker (Planned) |
Olga Budenkova |
Abstract Scope |
In situ X-ray observations are scarce for ternary and multi-component alloys. A Ga-In-Bi alloy is solidified in a Hele-Shaw cell under buoyancy-driven convection. A complex and strongly disoriented dendrite-type solid phase is formed that differs from a regular dendrite network. It is shown that primary arms of dendrites in a ternary system adapt their velocity to the local concentration ahead of their tips and change continuously or abruptly the growth direction. Some grains exhibit a morphology that is rather similar to the "seaweed" pattern. The appearance of seaweed grains is usually related to a solid/liquid interfacial energy. Further, we focus on the role of melt flow in transition from dendritic arrays to seaweed structures. In particular, it is shown that the splitting of a dendrite tip is preceded by the oscillation of the local intensity of the X-ray pattern which is related to the local concentration of the components. |
Proceedings Inclusion? |
Planned: |
Keywords |
Solidification, Other, |