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

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Title: 4D synchrotron X-ray tomographic quantification of the transition from cellular to dendrite growth during directional solidification
Author(s): Cai, B
Wang, J
Kao, A
Pericleous, K
Phillion, AB
Atwood, RC
Lee, PD
Item Type: Journal Article
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.
Publication Date: 17-Jul-2016
Date of Acceptance: 1-Jul-2016
URI: http://hdl.handle.net/10044/1/41448
DOI: http://dx.doi.org/10.1016/j.actamat.2016.07.002
ISSN: 1873-2453
Publisher: Elsevier
Start Page: 160
End Page: 169
Journal / Book Title: Acta Materialia
Volume: 117
Copyright Statement: This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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
Materials
0912 Materials Engineering
0913 Mechanical Engineering
Publication Status: Published
Appears in Collections:Materials



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