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Title: Microalloying effect of Cu and Nb on the microstructure and magnetic properties of Fe{sub 3}B/Nd{sub 2}Fe{sub 14}B nanocomposite permanent magnets

Abstract

This paper reports the microalloying effect of Cu and Nb on the microstructure and magnetic properties of a Fe{sub 3}B/Nd{sub 2}Fe{sub 14}B nanocomposite permanent magnet. Optimum magnetic properties with B{sub r} = 1.25 T, H{sub cJ} = 273 kA/m and (BH){sub max} = 125 kJ/m{sup 3} were obtained by annealing a melt-spun Nd{sub 4.5}Fe{sub 75.8}B{sub 18.5}Cu{sub 0.2}Nb{sub 1} amorphous ribbon at 660 C for 6 min. Compared with a ternary Nd{sub 4.5}Fe{sub 77}B{sub 18.5} alloy, the grain size is much finer in the optimum microstructure of the Cu and Nb containing alloys, and the temperature range of the heat-treatment for obtaining optimum hard magnetic properties was significantly extended. The soft magnetic Fe{sub 23}B{sub 6} phase coexists with Fe{sub 3}B and Nd{sub 2}Fe{sub 14}B phases in the optimum microstructure. Three-dimensional atom probe (3DAP) analysis results have revealed that the finer microstructure is due to the formation of a high number density of Cu clusters, which promote the nucleation of the Fe{sub 3}B phase. The Nb atoms appear to induce the formation of the Fe{sub 23}B{sub 6} phase and stabilize it by partitioning into this phase.

Authors:
; ; ;
Publication Date:
Research Org.:
National Research Inst. for Metals, Tsukuba (JP)
OSTI Identifier:
20000749
Resource Type:
Journal Article
Journal Name:
IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers)
Additional Journal Information:
Journal Volume: 35; Journal Issue: 5Pt2; Conference: 1999 international magnetics conference (Intermag '99), Kyongju (KR), 05/18/1999--05/21/1999; Other Information: PBD: Sep 1999; Journal ID: ISSN 0018-9464
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; METALLURGICAL EFFECTS; COPPER; NIOBIUM; MICROSTRUCTURE; MAGNETIC PROPERTIES; IRON BASE ALLOYS; BORON ALLOYS; NEODYMIUM ALLOYS; PERMANENT MAGNETS; COMPOSITE MATERIALS

Citation Formats

Ping, D.H., Hono, K., Kanekiyo, H., and Hirosawa, S. Microalloying effect of Cu and Nb on the microstructure and magnetic properties of Fe{sub 3}B/Nd{sub 2}Fe{sub 14}B nanocomposite permanent magnets. United States: N. p., 1999. Web. doi:10.1109/20.800492.
Ping, D.H., Hono, K., Kanekiyo, H., & Hirosawa, S. Microalloying effect of Cu and Nb on the microstructure and magnetic properties of Fe{sub 3}B/Nd{sub 2}Fe{sub 14}B nanocomposite permanent magnets. United States. doi:10.1109/20.800492.
Ping, D.H., Hono, K., Kanekiyo, H., and Hirosawa, S. Wed . "Microalloying effect of Cu and Nb on the microstructure and magnetic properties of Fe{sub 3}B/Nd{sub 2}Fe{sub 14}B nanocomposite permanent magnets". United States. doi:10.1109/20.800492.
@article{osti_20000749,
title = {Microalloying effect of Cu and Nb on the microstructure and magnetic properties of Fe{sub 3}B/Nd{sub 2}Fe{sub 14}B nanocomposite permanent magnets},
author = {Ping, D.H. and Hono, K. and Kanekiyo, H. and Hirosawa, S.},
abstractNote = {This paper reports the microalloying effect of Cu and Nb on the microstructure and magnetic properties of a Fe{sub 3}B/Nd{sub 2}Fe{sub 14}B nanocomposite permanent magnet. Optimum magnetic properties with B{sub r} = 1.25 T, H{sub cJ} = 273 kA/m and (BH){sub max} = 125 kJ/m{sup 3} were obtained by annealing a melt-spun Nd{sub 4.5}Fe{sub 75.8}B{sub 18.5}Cu{sub 0.2}Nb{sub 1} amorphous ribbon at 660 C for 6 min. Compared with a ternary Nd{sub 4.5}Fe{sub 77}B{sub 18.5} alloy, the grain size is much finer in the optimum microstructure of the Cu and Nb containing alloys, and the temperature range of the heat-treatment for obtaining optimum hard magnetic properties was significantly extended. The soft magnetic Fe{sub 23}B{sub 6} phase coexists with Fe{sub 3}B and Nd{sub 2}Fe{sub 14}B phases in the optimum microstructure. Three-dimensional atom probe (3DAP) analysis results have revealed that the finer microstructure is due to the formation of a high number density of Cu clusters, which promote the nucleation of the Fe{sub 3}B phase. The Nb atoms appear to induce the formation of the Fe{sub 23}B{sub 6} phase and stabilize it by partitioning into this phase.},
doi = {10.1109/20.800492},
journal = {IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers)},
issn = {0018-9464},
number = 5Pt2,
volume = 35,
place = {United States},
year = {1999},
month = {9}
}