Surface Morphology Characterization of a Dendrite in Al-Ge Observed by Synchrotron Tomoscopy | Chapter 3 | | Proceedings of the 8th International Conference on Solidification and Gravity

Dendrites can exhibit a rich variety of morphologies as they grow. Based on the local surface curvature, the morphology of a dendrite can be visualized in a 2D probability plot, called interface shape distribution (ISD) map. Synchrotron tomoscopy was used to observe the solidification of aluminum-germanium samples of different compositions, as it enables high temporal and spatial resolution. The steps required to extract a dendrite from a large tomoscopy data set are demonstrated using an Al-25wt.% Ge alloy, involving noise reduction and segmentation from the liquid phase. The three-dimensional dendrite morphology of a selected dendrite in an Al-45wt.% Ge alloy was studied in detail. Special attention is paid to the creation of the dendrite surface from the voxelized data. The influence of different smoothing parameters on the ISD map is shown. The suitability of the experimental and analytical approach to quantify dendrite morphology is demonstrated and will be applied to other alloy compositions in future work. It opens up new perspectives for determining properties such as the solid-liquid interfacial energy anisotropy, which influences the morphology of dendrites.

 

Author (s) Details

N. Bellenbaum
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Linder Höhe, 51170 Köln, Germany.

E. Sondermann
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Linder Höhe, 51170 Köln, Germany.

 

F. Yang
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Linder Höhe, 51170 Köln, Germany.

 

P. H. Kamm
Institute of Applied Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany.

 

T. R. Neu
Institute of Applied Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany.

 

F. García-Moren
Institute of Applied Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany.

 

F. Kargl
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Linder Höhe, 51170 Köln, Germany.

 

M. Becker
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Linder Höhe, 51170 Köln, Germany.

 

Please see the book here:- https://doi.org/10.9734/bpi/mono/978-93-49473-95-9/CH3