About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Frontiers in Solidification: An MPMD Symposium Honoring Jonathan A. Dantzig
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Presentation Title |
Eutectic Growth Dynamics during Directional Solidification with Velocity Ramps: In-situ Investigations in Microgravity |
Author(s) |
Victor T Witusiewicz, Ulrike Hecht, Sabine Bottin-Rousseau, Silvere Akamatsu |
On-Site Speaker (Planned) |
Silvere Akamatsu |
Abstract Scope |
The morphological features of coupled-growth patterns in directionally solidified eutectics not only depend on alloy characteristics and control parameters, but also on boundary conditions and the processing history. We report here on the first systematic in situ experiments in microgravity conditions, hence free of convection effects, performed in the ISS, aiming at evidencing the effect of downward and upward velocity "ramps" on rod-like eutectic growth patterns. Real-time observation was carried out by using a model transparent alloy (succinonitrile-d,camphor) with a low concentration of a third compound (neopentylglycol). The velocity was varied linearly, stepwise or in a more complex manner in time, over one order of magnitude, in the course of the experiments. Our observations show a contrasted behavior, in terms of spatial arrangement and inter-rod spacing distribution, depending on whether the velocity ramp was ascending or descending. The dynamics exhibited a marked hysteresis upon cycling. |
Proceedings Inclusion? |
Planned: |
Keywords |
Solidification, Modeling and Simulation, |