About this Abstract |
Meeting |
5th International Congress on 3D Materials Science (3DMS 2021)
|
Symposium
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5th International Congress on 3D Materials Science (3DMS 2021)
|
Presentation Title |
4D Characterization of Solidification in Al-based Droplets |
Author(s) |
Jonas Valloton, Abdoul-Aziz Bogno, Christian Schlepütz, Guillaume Reinhart, Michel Rappaz, Hani Henein |
On-Site Speaker (Planned) |
Jonas Valloton |
Abstract Scope |
Sub-millimeter droplets of near eutectic Al-Cu alloy were melted and solidified using the laser-based heating system available at the TOMCAT beamline of the Swiss Light Source. Cooling rates were monitored using a thermocouple placed at the base of the crucible. During cooling, radiography scans at 1 kHz frame rate were acquired in order to capture the solidification front in-situ. The corresponding field of view allowed the scanning of two droplets at once while providing sufficient resolution to observe the envelope of the solidification front (0.81 μm pixel size). Micro-tomography scans with a pixel size of 0.325 μm were then performed on the solidified samples to analyze the microstructure. Primary dendrites of either α-Al or Al2Cu were observed, followed by a eutectic front. The low growth velocities measured by radiography (100-10-1 mm/s) suggests low undercoolings. Surprisingly, a deviation from the typical <100> growth direction has been observed for primary Al dendrites. |
Proceedings Inclusion? |
Definite: Other |