|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Applications of Solidification Fundamentals
||In-situ Observation of Multiple Equiaxed Dendrite Interaction under Reduced Gravity Conditions
||Laszlo Sturz, Janin Eiken, Gerhard Zimmermann
|On-Site Speaker (Planned)
Equiaxed dendrite solidification has been investigated in-situ and under low-gravity conditions on the sounding-rocket mission MASER-13. Using high-resolution optical microscopy, the three-dimensional microstructural evolution of the equiaxed dendrites in the transparent alloy system neopentylglycol-30wt.-%camphor was recorded. Applying a small temperature gradient and constant cooling-rate to the sheet-like sample, the equiaxed dendrites were nucleating heterogeneously in the bulk liquid, growing and interacting under conditions dominated by chemical diffusion and transient undercooling. Dendrite morphology, multiple dendrite interaction and individual growth kinetics are investigated in detail. Comparison of the observed morphology to numerical calculations using the phase-field method helped to identify the crystallographic orientation of the primary dendrite arm growth direction, which were found to be dominated by <111> crystallographic planes under the present conditions.
||Planned: Supplemental Proceedings volume