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
Similar content being viewed by others
References
Koon, N. C., Das, B. N., Rubinstein, M., Tyson, J.: Magnetic Properties of R2Fe14B Single Crystals. J. Appl. Phys. 57 p. 4091 (1985).
Abache, C. Oesterreicher H.: Magnetic Properties of Compounds R2Fe14B. J. Appl. Phys. 57 p. 4112 (1985).
Schneider, G., Hening, E.-T., Petzow, G. Stadelmaier H. H.: Phase Relations in the System Nd-Fe-B. Z. Metallkd. 77 p. 755 (1986).
Ozawa, S., Saito, T. Motegi, T.: Effects of Cooling Rate on Microstructures and Magnetic Properties of Nd-Fe-B Alloys. J. Alloys. Comp. 363 p. 263 (2004).
Ozawa, S., Sato, H., Saito, T. Motegi, T.: Production of Nd-Fe-B Alloys by the Glass Slag Method. J. Appl. Phys. 91 p. 8831 (2002).
Ozawa, S., Li, M., Sugiyama, S., Jimbo, I., Kuribayashi, K.: Direct Crystallization of the Nd2Fe14B peritectic Phase by Containerless Solidification in a Drop Tube. Mater. Trans. 44 p. 806 (2003) 806–810.
Volkmann, T., Gao, J., Herlach, D. M.: Direct Crystallization of the Peritectic Nd2Fe14B1 Phase by Undercooling of Bulk Alloy Melts. Appl. Phys. Lett., 80 p. 1915 (2002).
Gao, J., Volkmann, T., Herlach, D. M.: Undercooling-dependent Solidification Behavior of Levitated Nd14Fe79B7 Alloy Droplets, Acta Mater. 50 p. 3003 (2002).
Gao, J., Volkmann, T., Roth, S., Löser, W., Herlach, D. M.: Phase Formation in Undercooled NdFeB Alloy Droplets. J. Magn. Magn. Mater. 234 p. 313(2001).
Gao, J., Volkmann, T., Herlach, D. M.: Solidification of Levitated Nd-Fe-B Alloy Droplets at Significant Bulk Undercooling. J. Alloys. Comp. 350 p. 344 (2003).
Ozawa S., Li M., Sugiyama S., Jimbo I., Hirosawa S., Kuribayashi K.: Microstructural Evolution and Magnetic Properties of the Nd-Fe-B Alloys Solidified from Undercooled Melt by Containerless Solidification. unpublished (2004).
Ozawa S., Li M., Sugiyama S., Jimbo I., Hirosawa S., Kuribayashi K.: Magnetic Properties of New Metastable Phase from Undercooled Nd-Fe-B Melts. Journal of Applied Physics (in press).
Ostwald, W.: Studien uber die Bildung und Umwandlung fester Korper. Z. Phys. Chem. 22 p. 289 (1897).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Ozawa, S., Sugiyama, S., Li, M. et al. Microstructure and magnetic properties of rare earth Nd-Fe system alloys produced by containerless processing. Microgravity sci. Technol. 16, 89–93 (2005). https://doi.org/10.1007/BF02945954
Issue Date:
DOI: https://doi.org/10.1007/BF02945954