| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials Research in Reduced Gravity
|
| Presentation Title |
In-situ Dynamics of Hybrid Eutectic Growth Front Morphologies: the Transparent Alloys Project |
| Author(s) |
Silvere Akamatsu, Sabine Bottin-Rousseau, Victor Witusiewicz, Ulrike Hecht |
| On-Site Speaker (Planned) |
Silvere Akamatsu |
| Abstract Scope |
We present in-situ observations of hybrid growth patterns during directional solidification of a transparent eutectic alloy in microgravity. Directionally solidified eutectics are of practical interest as self-organized composite materials with tunable microstructural features. Their formation results from a complex diffusion controlled dynamics at the solid-liquid interface. Thanks to in situ experiments developed in our laboratory, important results have been obtained on the morphological stability of lamellar and rod-like eutectic growth shapes. Ground experiments were limited to near-eutectic compositions of the alloy, thus avoiding detrimental effects of thermosolutal convection in the liquid. This, however, prevented one to properly investigate the open problem of the possible coexistence of rod-like, lamellar and other shapes of a lesser degree of symmetry. Aiming at a systematic study of that lamellar-to-rod transition, we undertook a science-in-microgravity project (ESA/NASA) on board the ISS called TRANSPARENT ALLOYS (TA). We will present the results of the first TA campaign. |
| Proceedings Inclusion? |
Planned: Publication Outside of TMS |