About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Frontiers in Solidification X
|
| Presentation Title |
Banded patterns in Al-based directional solidification in the presence of inert particles |
| Author(s) |
Jaime Perez Coronado, Shanmukha Kiran Aramanda, Zach Croft, Katsuyo Thornton, Ashwin Shahani, Alan Taub |
| On-Site Speaker (Planned) |
Jaime Perez Coronado |
| Abstract Scope |
Directional solidification experiments revealed a banded microstructure in aluminum-based metal matrix composites. This structure, identified through multiple three dimensional characterization techniques (namely, laboratory absorption and diffraction contrast tomography), features alternating particle-rich and particle-deficient regions throughout the entire specimen. Interestingly, the oscillations in particle density are correlated to oscillations in grain structure (columnar vs. equiaxed). As particles accumulate ahead of the solid-liquid interface due to particle-pushing by the growth front at the early stages of solidification, the front decelerates due to capillary, Zener type pinning forces and favors the development of an undercooled melt within which new equiaxed grains form. This process can repeat in a highly dynamic quasiperiodic process. Our experimental insights can guide the development of mesoscale simulations of microstructure evolution in heterogeneous materials that are simultaneously polyphase and polycrystalline. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Solidification, Aluminum, Characterization |