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1 PublicationObservation of sidearm splitting studied by high resolution X-ray radiography
Shevchenko, N.; Grenzer, J.; Keplinger, O.; Rack, A.; Eckert, S.
Abstract
The local dynamics of dendritic sidearms during the growth stage are studied by in-situ radiography observations at high spatial resolution of < 1 µm. A flat sample of a Ga-In alloy is solidified top-down applying a vertical temperature gradient. The evolving dendritic microstructure is visualized using synchrotron X-ray imaging at the beamline ID19 (ESRF, France). The experimental investigations on the dendrite evolution revealed a transition from a four-fold symmetry to a hyperbranched dendritic morphology. Both, the sidearm-splitting phenomena – responsible for this morphological transition – as well as the arm growth dynamics are characterized by image processing.
Keywords: Dendritic growth; Solidification; Sidearm splitting; Synchrotron X-ray imaging
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International Journal of Materials Research 111(2020)1, 11-16
DOI: 10.3139/146.111835
Cited 3 times in Scopus
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Permalink: https://www.hzdr.de/publications/Publ-28827