Application of neutron radiography for in-situ visualization of gallium solidification in travelling magnetic field

verfasst von: D. Musaeva, E. Baake, A. Köppen, P. Vontobel
Abstract: Visual information about the influence of electromagnetic stirring on solidifying metal is essential for the optimization of material processing methods. It has recently been shown that the method of neutron radiography can be extended for the investigation of complex metallurgical processes in opaque media. The paper discusses the results of successful neutron imaging technique application to observe in real time the formation of the solid/liquid interface of a solidifying gallium melt stirred by a travelling magnetic field. Continuous and pulsed at low frequency application of the field was investigated to analyze the influence of the EM driven flow on the formation of ingots. The shape of the interface between the solid and liquid phases and the structural irregularity of the solid/liquid surface were analyzed. The results were compared with those for crystal growth without electromagnetic stirring. Comparing to other regimes has shown that the pulsed stirring at frequencies close to the characteristic frequency of melt circulation leads to the formation of a flatter solidification front with a more regular solid/liquid interface, which evidences of more uniform heat transfer conditions in the melt, and the method of neutron radiography makes it possible to obtain such information.
Organisationseinheit(en): Institut für Elektroprozesstechnik
Externe Organisation(en): Kazan State Power Engineering University
Paul Scherrer Institut (PSI)
Typ: Artikel
Journal: Magnetohydrodynamics
Band: 53
Seiten: 583-593
Anzahl der Seiten: 11
ISSN: 0024-998X
Publikationsdatum: 2017
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Physik und Astronomie (insg.), Elektrotechnik und Elektronik
Elektronische Version(en): https://doi.org/10.22364/mhd.53.3.14 (Zugang: Geschlossen)

BibTeX

@article{c45b3baa6c4f4cc8aa2a193ae3c4688f,
title = "Application of neutron radiography for in-situ visualization of gallium solidification in travelling magnetic field",
abstract = "Visual information about the influence of electromagnetic stirring on solidifying metal is essential for the optimization of material processing methods. It has recently been shown that the method of neutron radiography can be extended for the investigation of complex metallurgical processes in opaque media. The paper discusses the results of successful neutron imaging technique application to observe in real time the formation of the solid/liquid interface of a solidifying gallium melt stirred by a travelling magnetic field. Continuous and pulsed at low frequency application of the field was investigated to analyze the influence of the EM driven flow on the formation of ingots. The shape of the interface between the solid and liquid phases and the structural irregularity of the solid/liquid surface were analyzed. The results were compared with those for crystal growth without electromagnetic stirring. Comparing to other regimes has shown that the pulsed stirring at frequencies close to the characteristic frequency of melt circulation leads to the formation of a flatter solidification front with a more regular solid/liquid interface, which evidences of more uniform heat transfer conditions in the melt, and the method of neutron radiography makes it possible to obtain such information.",
author = "D. Musaeva and E. Baake and A. K{\"o}ppen and P. Vontobel",
note = "Funding information: Acknowledgments. Authors are grateful to the Helmholtz Association in the framework of the Helmholtz-Alliance LIMTECH (Liquid Metal Technology) for financial support of the investigation and to the colleagues from Paul Scherrer Institute for their help during the experiments.",
year = "2017",
doi = "10.22364/mhd.53.3.14",
language = "English",
volume = "53",
pages = "583--593",
journal = "Magnetohydrodynamics",
issn = "0024-998X",
publisher = "Institute of Physics, University of Latvia",
number = "3",
}