| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Melt Processing, Casting and Recycling
|
| Presentation Title |
Tracking Primary Al3Ti and Al3Zr Phase Formation in Liquid Aluminum Alloys Using LIBS |
| Author(s) |
Mehdi Maghsoudi, Georges Salloum-Abou-Jaoude, Juan-Ricardo Castillo-Sanchez, Snorri Ingvarsson, Kristjan Leosson |
| On-Site Speaker (Planned) |
Mehdi Maghsoudi |
| Abstract Scope |
Increased recycling share in aluminum production increases impurity content resulting higher risk of stabilizing primary intermetallics. Having precise thermodynamic databases is crucial for avoiding primaries during solidification. In this work, we evaluate experimentally the liquidus lines of Al–Ti and Al–Zr phase diagrams using direct analysis of dilute molten alloys with laser-induced breakdown spectroscopy (LIBS). The liquid alloys are cooled and heated at different rates and the liquid composition is measured continuously using LIBS. The results at slow cooling rates show that concentration measurements follow the predicted liquidus lines of the phase diagrams; we point out discrepancies within the available thermodynamic databases. LIBS measurements at non-equilibrium cooling rates show nucleation undercoolings, which depend on the cooling rate and the initial composition of the alloys. Comparing the undercooling of different alloy concentrations at different cooling rates reveals that Al3Ti-D022 nucleates easier than Al3Zr-D023. |
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Solidification, |