|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||2023 Technical Division Student Poster Contest
||SPG-29: In Operando Synchrotron X-ray Tomography Study of Fine Eutectic Polyphase Solidification Patterns
||Paul Chao, George R. Lindemann, Shanmukha Kiran Aramanda, Ashwin J. Shahani
|On-Site Speaker (Planned)
Eutectics are a paradigm of natural composite materials consisting of two, entangled single-crystal phases. The simultaneous crystallization of two solid eutectic phases creates highly ordered patterns of remarkable complexity. One or both of the solid phases may possess a strong anisotropy of interfacial energy and/or mobility with respect to the liquid phase, which leads to a faceted growth front. These effects have been hypothesized to influence the coupling of the solute diffusion fields ahead of the composite eutectic growth front and thus modify the resulting two-phase pattern that solidifies. Here, I leverage state-of-the-art synchrotron-based in-situ x-ray tomography to visualize in unprecedented detail the growth trajectories of both eutectic solids in four-dimensions (i.e., three-dimensional space plus time). We compare against classical theories, specifically how pattern selection mechanisms are governed by crystalline anisotropy and growth velocity. These experimental results can inform development of complex multiphase materials with unique mechanical or electrical properties.
||Solidification, Aluminum, Machine Learning