About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Materials Research in Reduced Gravity
|
Presentation Title |
Evolution of Dendritic Extended 3D Patterns during Directional Solidification: Microgravity Experiments in DECLIC-DSI Onboard ISS and Phase-field Modeling |
Author(s) |
Kaihua Ji, Fatima L. Mota, Trevor Lyons, Louise L. Littles, Rohit Trivedi, Nathalie Bergeon, Alain Karma |
On-Site Speaker (Planned) |
Kaihua Ji |
Abstract Scope |
To characterize the dynamical formation of three-dimensional (3D) arrays of dendrites under diffusive growth conditions, in situ monitoring of a series of experiments on a transparent succinonitrile – 0.46 wt% camphor model alloy was carried out under low gravity in the DECLIC Directional Solidification Insert onboard the International Space Station. These experiments offer continuous interface observation and enable the construction of space-time evolution maps of dendrite location and primary spacing during directional solidification. We present the evolution of dendritic extended 3D patterns for a large range of parameters displaying different levels of sidebranching in both experiments and phase-field simulations. The combined and separate effects of macroscopic interface curvature and crystal misorientation are evidenced and detailed. In addition, the aligned dendritic array caused by the invasion of dendrites formed at the edge of the crucible border is investigated. |
Proceedings Inclusion? |
Planned: |
Keywords |
Solidification, Modeling and Simulation, Computational Materials Science & Engineering |