About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Frontiers in Solidification: An MPMD Symposium Honoring Jonathan A. Dantzig
|
Presentation Title |
In Situ Synchrotron X-ray Radio- and Tomography Analysis of Grain Boundary Formation during Directional Solidification of a Mg Alloy |
Author(s) |
Maral Sarebanzadeh, Alberto Orozco-Caballero, Federico Sket, Damien Tourret, Javier LLorca |
On-Site Speaker (Planned) |
Damien Tourret |
Abstract Scope |
The selection of grain boundaries (GBs) during columnar solidification of hcp alloys is less explored than in cubic (fcc, bcc) systems. In this study, GBs forming during directional solidification of polycrystalline magnesium (Mg) alloys are investigated via in situ synchrotron X-ray imaging. Two experimental setups were designed that each consist of two heating elements generating a controlled thermal gradient and cooling rate in the sample. Alloy samples are encapsulated in an Ar atmosphere to avoid oxidation. Resulting time-resolved radiographs or tomographs during melting and solidification of various binary Mg alloys (e.g. Mg-Gd) provide quantitative data on the dendritic growth dynamics and the selection of GBs during polycrystalline dendritic growth in hcp alloys. Beyond validating the apparatus and highlighting its potential for in situ characterization of dynamical phenomena in metallic alloys solidification, these results are discussed in light of phase-field simulations of bi-crystal grain growth competition. |
Proceedings Inclusion? |
Planned: |
Keywords |
Solidification, Magnesium, |