Electromagnetic levitation was used to melt and solidify containerlessly Nd–Fe–B alloys. A method was developed to reduce and evaporate stable solid Nd oxides at the surface of the liquid samples. The oxides otherwise limit the undercoolability of the highly reactive Nd-based alloys. In such a way, undercoolings up to 150 K of the levitation processed samples were achieved. Owing to the large undercooling range, the intermetallic phase with the hard magnetic properties was primarily crystallized at undercoolings exceeding 50 K. Solidification of the pro-peritectic γ-Fe with soft magnetic properties was successfully suppressed. At the largest undercoolings, a metastable phase, likely to be of the composition is primarily formed while the crystallization of phase is followed up in a subsequent step.
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18 March 2002
Research Article|
March 18 2002
Direct crystallization of the peritectic phase by undercooling of bulk alloy melts
Thomas Volkmann;
Thomas Volkmann
Institut für Experimentalphysik IV, Ruhr-Universität Bochum, D-44780 Bochum
Institut für Raumsimulation, Deutsches Zentrum für Luft- und Raumfahrt, D-51170 Köln, Germany
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Jianrong Gao;
Jianrong Gao
Department of Applied Physics, Northwestern Polytechnical University, Xian 710072, People’s Republic of China
Institut für Raumsimulation, Deutsches Zentrum für Luft- und Raumfahrt, D-51170 Köln, Germany
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Dieter M. Herlach
Dieter M. Herlach
Institut für Raumsimulation, Deutsches Zentrum für Luft- und Raumfahrt, D-51170 Köln, Germany
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Appl. Phys. Lett. 80, 1915–1917 (2002)
Article history
Received:
June 22 2001
Accepted:
January 17 2002
Citation
Thomas Volkmann, Jianrong Gao, Dieter M. Herlach; Direct crystallization of the peritectic phase by undercooling of bulk alloy melts. Appl. Phys. Lett. 18 March 2002; 80 (11): 1915–1917. https://doi.org/10.1063/1.1461430
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