About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Frontiers in Solidification X
|
| Presentation Title |
Quantifying morphology-dependent kinetics in rapidly solidified Al-10wt%Si-0.4wt%Sc |
| Author(s) |
Akankshya Sahoo, Jonas Valloton, Abdoul-Aziz Bogno, Hani Henein |
| On-Site Speaker (Planned) |
Jonas Valloton |
| Abstract Scope |
Dendrite growth follows kinetically favorable directions, with the kinetic coefficient (μk) well-studied for ⟨100⟩ growth in near-equilibrium regimes but unexplored under rapid solidification (RS) regime. Here we combine Differential Scanning Calorimetry (DSC) and Impulse Atomization (IA) data with the Local Non-Equilibrium Model (LNM) to resolve dendrite tip velocity and undercooling components in Al-10Si-0.4Sc (wt.%). μk, ⟨100⟩ is shown to decrease from near-equilibrium (DSC) to RS (IA), indicating a hindered ⟨100⟩ growth with increasing undercooling ΔT. A renewed increase in μk is observed at a critical ΔT = 155 K, marking a dendrite orientation transition (DOT) from ⟨100⟩ to ⟨320⟩ driven by kinetic undercooling overtaking constitutional effects (ΔTk > ΔTc). This reveals a lower atomic attachment barrier for ⟨320⟩ in the RS regime. Our results provide quantitative μk values for multiple orientations under RS, challenging constant-μk assumptions and establishing a morphology-sensitive kinetic framework to guide solidification modeling and alloy design. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, Other, Other |