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Microstructure and magnetic properties of rare earth Nd-Fe system alloys produced by containerless processing |
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| Authors: | S. Ozawa S. Sugiyama M. Li I. Jimbo S. Hirosawa K. Kuribayashi |
| Affiliation: | 1. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, 229-8510, Sagamihara, Japan 2. Department of Materials Science, Tokai University, 1117 Kitakaname, 259-1292, Hiratsuka, Japan 3. Research and Development Center, NEOMAX Co., Ltd, Mishima, 618-0013, Osaka, Japan |
| Abstract: | NdxFe100?1.5xB0.5x alloys (x=10, 11.8, and 14) were solidified from the undercooled melts by drop tube processing. The samples contained a large amount of the metastable phase with the composition near to their bulk composition in each alloy. The volume fraction of the metastable phase increased as the sample diameter decreased. The metastable phase was partially decomposed into very fine lamellar grains of the Nd2Fe14B and α-Fe or Nd2Fe14B and some Nd-rich phase by solid-state reaction in the samples with a diameter of 1200μm. The solidification behavior of the metastable phase was explained in terms of a hypothetic scheme of the pseudobinary Nd-Fe-B phase diagram |
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