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 |
About the Complexity of Using a ‘Simple’ Transparent Model Alloy to Study Peritectic Couple Growth in Microgravity |
Author(s) |
Andreas Ludwig, Johann Mogeritsch |
On-Site Speaker (Planned) |
Andreas Ludwig |
Abstract Scope |
Peritectic coupled growth (PCG) under purely diffusive conditions were investigated using the ESA's Transparent Alloy facility onboard of the International Space Station in 2021. For this purpose, the transparent metal-like solidifying organic system TRIS-NPG (TRIS: tris-(hydroxymethyl)aminomethane, NPG: neopentylglycol) known to show a peritectic invariant reaction at round 0.51 mol fraction NPG was used. It turned out that quite a large number of unexpected phenomena governed the occurrence of PCG. These are (i) grain coarsening and grain boundary migration and its implication on the establishing of the initial planar front; (ii) occurrence of a thermal bias and the resulting concentration variations within in the cartridge; (iii) unknown nucleation hindrance for the peritectic beta phase and the metastability of the properitectic alpha phase; (iv) low and constant growth velocity and an ‘initial’ transient that seems not to end. Nevertheless, we have found suitable conditions for the occurrence of PCG. |
Proceedings Inclusion? |
Planned: |
Keywords |
Solidification, |