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4D synchrotron X-ray tomographic quantification of the transition from cellular to dendrite growth during directional solidification

Cai, B; Wang, J; Kao, A; Pericleous, K; Phillion, AB; Atwood, RC; Lee, PD; (2016) 4D synchrotron X-ray tomographic quantification of the transition from cellular to dendrite growth during directional solidification. Acta Materialia , 117 pp. 160-169. 10.1016/j.actamat.2016.07.002. Green open access

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Abstract

Solidification morphology directly impacts the mechanical properties of materials; hence many models of the morphological evolution of dendritic structures have been formulated. However, there is a paucity of validation data for directional solidification models, especially the direct observations of metallic alloys, both for cellular and dendritic structures. In this study, we performed 4D synchrotron X-ray tomographic imaging (three spatial directions plus time), to study the transition from cellular to a columnar dendritic morphology and the subsequent growth of columnar dendrite in a temperature gradient stage. The cellular morphology was found to be highly complex, with frequent lateral bridging. Protrusions growing out of the cellular front with the onset of morphological instabilities were captured, together with the subsequent development of these protrusions into established dendrites. Other mechanisms affecting the solidification microstructure, including dendrite fragmentation/pinch-off were also captured and the quantitative results were compared to proposed mechanisms. The results demonstrate that 4D imaging can provide new data to both inform and validate solidification models.

Type: Article
Title: 4D synchrotron X-ray tomographic quantification of the transition from cellular to dendrite growth during directional solidification
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.actamat.2016.07.002
Publisher version: https://doi.org/10.1016/j.actamat.2016.07.002
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Technology, Materials Science, Multidisciplinary, Metallurgy & Metallurgical Engineering, Materials Science, Solidification, Dendrite, Interface instability, X-ray tomography, Al alloy, IN-SITU OBSERVATION, AL-CU ALLOY, PATTERN-FORMATION, INITIAL INSTABILITY, VIDEO MICROSCOPY, FLUID-FLOW, REAL-TIME, EVOLUTION, FRAGMENTATION, RADIOGRAPHY
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/10049091
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