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Characterization of Dendrite Morphologies in Rapidly Solidified Al-4.5wt.%Cu Droplets

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dc.contributor.authorBedel, M.
dc.contributor.authorReinhart, G.
dc.contributor.authorBogno, A.-A.
dc.contributor.authorGandin, Ch.-A.
dc.contributor.authorJacomet, S.
dc.contributor.authorBoller, E.
dc.contributor.authorNguyen-Thi, H.
dc.contributor.authorHenein, H.
dc.date.accessioned2025-05-01T20:45:34Z
dc.date.available2025-05-01T20:45:34Z
dc.date.issued2016-01-01
dc.descriptionThe Impulse Atomization process developed at the University of Alberta (Canada) enables metallic powders to be solidified with well controlled process parameters. The inner microstructure of several droplets of Al-4.5wt.%Cu alloy produced by this technique has been investigated by using both synchrotron X-ray micro-tomography and electron backscattered diffraction (EBSD). The 3D reconstructions obtained by micro-tomography are used to visualize cross sections of the droplets in any spacial directions. A wide range of dendrite morphologies are observed for different droplets of similar diameter and produced in the same batch. Microstructural features indicate that the development of the dendrite arms (primary and of higher orders) occurs in most droplets along <111> crystallographic axes. This was unexpected as <100> directions are observed in conventional casting technologies. EBSD measurements were carried out on a selection of representative droplets after their characterization by synchrotron X-ray micro-tomography. Results confirm that most of the droplets are single grains and the relationship between the dendrite growth directions and the crystal orientation is determined unambiguously. Moreover, the large number of droplets analyzed by micro-tomography enabled a statistical analysis of the dendrite morphology as a function of droplet size and cooling atmosphere. The impact of different processing parameters on the final distribution of dendrite morphologies is also discussed.
dc.identifier.doihttps://doi.org/10.7939/R3FX74C3W
dc.language.isoen
dc.relationhttps://doi.org/10.1016/j.actamat.2015.02.007
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectSynchrotron X-ray Micro-Tomography
dc.subjectImpulse Atomization
dc.subjectRapid Solidification
dc.subjectDendrite Morphology
dc.subjectElectron Backscattered Diffraction
dc.titleCharacterization of Dendrite Morphologies in Rapidly Solidified Al-4.5wt.%Cu Droplets
dc.typehttp://purl.org/coar/resource_type/c_6501 http://purl.org/coar/version/c_970fb48d4fbd8a85
ual.jupiterAccesshttp://terms.library.ualberta.ca/public

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