Abstract
Twinned dendrites appearing in an Al-26 wt pct Zn alloy have been quenched during growth using a specifically designed setup that is positioned on top of a directional solidification experiment. X-ray tomography performed at the Swiss Light Source (SLS-beamline TOMCAT) allowed us to reconstruct the 3D morphology of these structures and to confirm previous observations performed on single 2D sections (Henry et al., Metall Mater Trans A 35A:2495–2501, 2004; Salgado-Ordorica and Rappaz, Acta Mater 56:5708–5718, 2008). Further characterization of these quenched specimens led to a better description of the mechanisms involved in the in-plane and lateral growth propagation of twinned dendrites. These were then put into relation with the competition mechanisms taking place during simultaneous solidification of twinned and regular dendrites.
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Notes
When trying to grow twinned dendrites from a twinned seed in a Bridgman furnace, we observed that individual regular dendrites only form.[16] Anada et al.[17] could produce successfully Al-7 wt. % Mg twinned dendrites in a Bridgman setup, thanks probably to the presence of magnesium and the large diameter of the crucibles (25 mm) which not only induced enough solutal convection, but also made quenching very inefficient.
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Acknowledgments
The authors would like to thank the staff of the Interdisciplinary Center for Electron Microscopy of the Ecole Polytechnique Fédérale de Lausanne (EPFL), and in particular, Dr Emmanuelle Boehm, for the help in the EBSD measurements. The help of Jean-Daniel Wagnière in constructing the quenching device is also greatly appreciated. The authors would also like to thank Prof. M. Stampanoni and Dr. Samuel McDonald for their help in conducting the tomography experiments using the TOMCAT beamline at the SLS.
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Manuscript submitted March 25, 2012.
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Salgado-Ordorica, M.A., Phillion, A.B. & Rappaz, M. Morphology and Growth Kinetic Advantage of Quenched Twinned Dendrites in Al-Zn Alloys. Metall Mater Trans A 44, 2699–2706 (2013). https://doi.org/10.1007/s11661-012-1539-0
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DOI: https://doi.org/10.1007/s11661-012-1539-0