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Revealing dendritic pattern formation in Ni, Fe and Co alloys using synchrotron tomography

Azeem, MA; Lee, PD; Phillion, AB; Karagadde, S; Rockett, P; Atwood, RC; Courtois, L; ... Dye, D; + view all (2017) Revealing dendritic pattern formation in Ni, Fe and Co alloys using synchrotron tomography. Acta Materialia , 128 pp. 241-248. 10.1016/j.actamat.2017.02.022. Green open access

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Abstract

The microstructural patterns formed during liquid to solid phase transformations control the properties of a wide range of materials. We developed a novel methodology that enables in situ quantification of the microstructures formed during solidification of high temperature advanced alloys via synchrotron tomography. The patterns formed are captured in 4D (3D plus time) using a methodology which exploits three separate advances: a bespoke high temperature environment cell; the development of high X-ray contrast alloys; and a novel environmental encapsulation system. This methodology is demonstrated on Ni, Fe, and Co advanced alloy systems, revealing dendritic pattern formation. We present detailed quantification of microstructural pattern evolution in a novel high attenuation contrast Co-Hf alloy, including microstructural patterning and dendrite tip velocity. The images are quantified to provide 4D experimental data of growth and coarsening mechanisms in Co alloys, which are used for a range of applications from energy to aerospace.

Type: Article
Title: Revealing dendritic pattern formation in Ni, Fe and Co alloys using synchrotron tomography
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.actamat.2017.02.022
Publisher version: http://dx.doi.org/10.1016/j.actamat.2017.02.022
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: Superalloys, Synchrotron tomography, Interfacial patterns, 4D imaging, Dendritic microstructures
UCL classification: UCL
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/10049369
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