|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Advanced Real Time Imaging
||In situ observations of rapid solidification of metallic materials using a high-speed camera
||Dandan Zhao, Jianrong Gao
|On-Site Speaker (Planned)
Liquid metals and alloys can be undercooled significantly below their equilibrium freezing temperatures using techniques such as containerless processing or glass fluxing. This undercooling phenomenon brings about rapid solidification of a bulk liquid at low cooling rates allowing for in situ measurements of crystal growth velocities by monitoring of thermal diffusion on the surface of a liquid droplet. In our work, we conducted in situ measurements of tip velocities of an equiaxed dendrite growing into the undercooled liquid of binary alloys using a digital high-speed camera. Measured data are compared with existing theories on rapid alloy solidification. It is concluded that only a recent theory is in agreement with experiment over the whole bath undercooling regime whereas earlier ones are at marked variance either at low or high bath undercoolings.
||Characterization, Solidification, Modeling and Simulation