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Fast synchrotron X-ray tomographic quantification of dendrite evolution during the solidification of Mg—Sn alloys

Shuai, S; Guo, E; Phillion, AB; Callaghan, MD; Jing, T; Lee, PD; (2016) Fast synchrotron X-ray tomographic quantification of dendrite evolution during the solidification of Mg—Sn alloys. Acta Materialia , 118 pp. 260-269. 10.1016/j.actamat.2016.07.047. Green open access

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Abstract

The evolution of dendritic microstructures during the solidification of a Mg-15 wt%Sn alloy was investigated in situ via fast synchrotron X-ray microtomography. To enable these in situ observations a novel encapsulation method was developed and integrated into a fast, pink beam, imaging beamline at Diamond Light Source. The dendritic growth was quantified with time using: solid volume fraction, tip velocity, interface specific surface area, and surface curvature. The influence of cooling rate upon these quantities and primary phase nucleation was investigated. The primary dendrites grew with an 18-branch, 6-fold symmetry structure, accompanied by coarsening. The coarsening process was assessed by the specific surface area and was compared with the existing models. These results provide the first quantification of dendritic growth during the solidification of Mg alloys, confirming existing analytic models and providing experimental data to inform and validate more complex numeric models.

Type: Article
Title: Fast synchrotron X-ray tomographic quantification of dendrite evolution during the solidification of Mg—Sn alloys
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.actamat.2016.07.047
Publisher version: http://dx.doi.org/10.1016/j.actamat.2016.07.047
Language: English
Additional information: Copyright © 2016 Acta Materialia Inc. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Keywords: Magnesium alloy, Dendritic growth, 3-D X-ray tomography, Coarsening mechanism, Crystallographic orientation
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10049115
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