Observation of side arm splitting studied by high resolution X-ray radiography: Paper presented at the Symposium “Tomographic and Radiographic Imaging with Synchrotron X-rays and Neutrons” of the MSE 2018, 26–28 September 2018, Darmstadt, Germany

Natalia Shevchenko; Joerg Grenzer; Olga Keplinger; Alexander Rack; Sven Eckert

doi:10.3139/146.111835

Published by De Gruyter December 25, 2019

Observation of side arm splitting studied by high resolution X-ray radiography

Paper presented at the Symposium “Tomographic and Radiographic Imaging with Synchrotron X-rays and Neutrons” of the MSE 2018, 26–28 September 2018, Darmstadt, Germany

Natalia Shevchenko , Joerg Grenzer , Olga Keplinger , Alexander Rack and Sven Eckert

From the journal International Journal of Materials Research

https://doi.org/10.3139/146.111835

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Abstract

The local dynamics of dendritic side arms during the growth stage were studied by in-situ radiography observations at high spatial resolution of better than 1 μm. A flat sample of a Ga–In alloy was solidified top-down applying a vertical temperature gradient. The evolving dendritic microstructure was 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 side arm-splitting phenomenon – responsible for this morphological transition – as well as the arm growth dynamics were characterized using image processing.

Keywords: Dendritic growth; Solidification; Side arm splitting; Synchrotron X-ray imaging

∗ Correspondence address, Dr. Natalia Shevchenko, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany, Tel.: +493512603313, Fax: +493512602007, E-mail: n.shevchenko@hzdr.de, Web: https://www.hzdr.de

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Received: 2018-12-05

Accepted: 2019-05-14

Published Online: 2019-12-25

Published in Print: 2020-01-09

Observation of side arm splitting studied by high resolution X-ray radiography

Paper presented at the Symposium “Tomographic and Radiographic Imaging with Synchrotron X-rays and Neutrons” of the MSE 2018, 26–28 September 2018, Darmstadt, Germany

Abstract

References

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