| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials Research in Reduced Gravity
|
| Presentation Title |
Peritectic Coupled Growth Under Reduced Gravity |
| Author(s) |
Andreas Ludwig, Johann Mogeritsch |
| On-Site Speaker (Planned) |
Andreas Ludwig |
| Abstract Scope |
Peritectic coupled growth under purely diffusive conditions were investigated using the ESA's Transparent Alloy facility onboard of the International Space Station in 2021. For the series of the directions solidification experiments, the transparent metal-like solidifying organic system TRIS-NPG (TRIS: tris-(hydroxymethyl)aminomethane, NPG: neopentylglycol) was used. Competitive growth was observed only for pulling velocity's close to the constitutional undercooling limits of both solid phases. Furthermore, steady-state growth conditions were never reached and the peritectic beta-phase revealed a decreased phase fraction that is associated with a transition from patch-like, lamellar, to rod-like growth. The experimental facts prove an accumulation of solute ahead of the front as known from a growing single phase during initial transient. However, the results also indicate that the properitectic alpha-phase is the preferred growth phase even in the metastable region and that peritectic coupled growth continues far below the peritectic temperature. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Solidification, Phase Transformations, |