|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advanced Real Time Imaging
||Pseudo-4D Characterization of Lamella Orientations in Locked Al-Al2Cu Eutectic Colonies
||Paul Chao, George Lindemann, Ashwin J. Shahani
|On-Site Speaker (Planned)
We employed a novel imaging approach that combines in-situ X-ray radiography and ex-situ X-ray tomography to reconstruct the solid-liquid interface position within a solidifying Al-Cu metallic melt of near eutectic composition in three dimensions. The real time perspective of Al-Al2Cu eutectic pattern formation emerging from the melt provides unprecedented experimental evidence of the influence of an anisotropic solid solid interphase boundary energy on the pattern dynamics in a locked eutectic growth under transient solidification conditions. The wealth of information enabled us to quantify how the underlying eutectic microstructure adapts to oscillations in solid-liquid interfacial velocity and interfacial curvature. Our quasi 4D tomography approach holds broad application to the characterization of rapidly evolving fine microstructures, as it can temporally resolve the solidification process on the order of seconds and spatially resolves individual features (here, lamellae) on the order of micrometers.
||Solidification, Characterization, Aluminum