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Aluminum Substitutions in Nd-Fe-B Sintered Magnets

  • J. K. Chen (a1) and G. Thomas (a2)

Abstract

A microstructural and microanalytical study of aluminum substituted Nd-Fe-B sintered permanent magnets were carried out to determine the effect, if any, of aluminum on structure, composition, and magnetic properties, particularly on the observed increase in coercivity. It was found that Al enrichment occurred in the Nd-rich phase at the grain boundaries. The possible role(s) of this enrichment on the observed coercivity increase are discussed.

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1. Sagawa, M., Fujimura, S., Togawa, N., Yamamoto, H., and Matsuura, Y., J. Appl. Phys. 55, 2083 (1984).
2. Yang, Y.C., James, W.J., Li, X., Chen, H., and Xu, L., IEEE Trans. on Mag. 22, 757 (1986).
3. Burzo, E., Pedziwiatr, A.T., and Wallace, W.E., Sol. State Comm. 61, 57 (1987).
4. Mishra, R., Chen, J.K., and Thomas, G., J. Appl. Phys. 59, 2244 (1986).
5. Ramesh, R., Chen, J.K., and Thomas, G., presented at the 1986 Intermag Conference, Phoenix, AZ. (in press)
6. Ramesh, R. and Soffa, W. (private communication).

Aluminum Substitutions in Nd-Fe-B Sintered Magnets

  • J. K. Chen (a1) and G. Thomas (a2)

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