|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Applications of Solidification Fundamentals
||4D Synchrotron X-ray Quantification of the Cellular to Dendritic Transition
||Biao Cai, Peter Lee, Andrew Kao, Andre Phillion, Koulis Pericleous
|On-Site Speaker (Planned)
Solidification morphology directly impacts the properties of materials; hence investigating the morphological evolution of dendritic structures is important to fields ranging from alloy manufacturing to battery failure prediction. We have used 4D (3D plus time) synchrotron X-ray tomographic imaging to capture the transition from a cellular to columnar dendritic morphology, together with the subsequent development of the columnar dendrites in a temperature gradient stage. The cellular morphology was found to be highly complex, with frequent lateral bridging. The onset Mullins-Sekerka morphological instability of the cellular front, resulting in protrusions forming and becoming dendrites was observed and quantified. Other mechanisms affecting the solidification microstructure, including dendrite coarsening and fragmentation were also captured and the quantitative results compared to analytic models. The results demonstrate that 4D imaging can both inform and validate solidification models.
||Planned: Supplemental Proceedings volume