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Phase Formation in Undercooled Sm–Co Alloy Melts

Reutzel, S. and Strohmenger, J. and Volkmann, T. and Gao, J. and Herlach, D. M. (2007) Phase Formation in Undercooled Sm–Co Alloy Melts. Materials Science and Engineering A, 449-45, pp. 709-712. Elsevier B.V.. DOI: 10.1016/j.msea.2006.02.358.

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Abstract

Sm<sub>x</sub>Co<sub>100−x</sub> alloy melts (x = 10.5, 12.5 and 17 at.%) are processed containerlessly by electromagnetic levitation and drop-tube technique in order to get access to the metastable state of the undercooled melt. By dint of undercooling non-equilibrium phase formation is facilitated. The solidified specimen are subsequently analyzed by electron microscopy, X-ray diffraction and thermal magnetic analyses. The results show that different types of solidification behaviors are observed depending on alloy composition and undercooling level prior to solidification. Bulk samples processed by electromagnetic levitation technique are solidified by primary formation of either Sm<sub>2</sub>Co<sub>17</sub> or SmCo<sub>5</sub>, whereas primary phase formation of metastable SmCo7 is detected in small particles attained by drop-tube processing where cooling rates lie in the order of 10<sup>3</sup>–10<sup>5</sup> K/s.

Document Type:Article
Title:Phase Formation in Undercooled Sm–Co Alloy Melts
Authors:
AuthorsInstitution or Email of Authors
Reutzel, S.Ruhr-Universität Bochum
Strohmenger, J.UNSPECIFIED
Volkmann, T.UNSPECIFIED
Gao, J.Northeastern-University, Shenyang, China
Herlach, D. M.UNSPECIFIED
Date:2007
Journal or Publication Title:Materials Science and Engineering A
Volume:449-45
DOI:10.1016/j.msea.2006.02.358
Page Range:pp. 709-712
Publisher:Elsevier B.V.
Status:Published
Keywords:Unterkühlung von Materialien
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Institute of Space Simulation > Center for Solidification of Undercooled Melts (ZEUS)
Deposited By: Dr.rer.nat. Sven Reutzel
Deposited On:05 Jun 2007
Last Modified:12 Dec 2013 20:21

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