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Microstructure of strip cast alloys for high performance NdFeB magnets

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Abstract

Applications of strip cast (SC) alloys for production of high performance Nd-Fe-B sintered magnets are increasing rapidly. Because of the fast cooling rate during the codification, the formation of detrimental {alpha}-Fe dendrites and of large pools of Nd rich phase are suppressed, hence improving the magnetic properties of the magnets. We have investigated the influence of the composition on the microstructure of the SC alloys and found: (1) the formation of {alpha}-Fe can be suppressed if the alloy contains Nd more than 28.5 wt % in Nd-Fe-B ternary alloys, (2) no {alpha}-Fe formation occurs in the SC alloys with 10 wt % or more substitution of Nd by Dy even for the 2-14-1 stoichiometric alloys, (3) the Dy substitution increases the tendency for 2-17 phase formation. (orig.)
Authors:
Hirose, Y; Hasegawa, H; Sasaki, S [1] 
  1. Showa Denko K.K., Tokyo (Japan). Central Research Lab.
Publication Date:
Jul 01, 1998
Product Type:
Conference
Reference Number:
EDB-00:045293
Resource Relation:
Conference: 15. international workshop on rare-earth magnets and their applications (REM-15) and 10. international symposium on magnetic anisotropy and coercivity in rare-earth transition metal alloys, and exhibition, Dresden (Germany), 30 Aug - 4 Sep 1998; Other Information: 10 refs.; PBD: 1998; Related Information: In: Rare-earth magnets and their applications. Vol. 1. Proceedings, by Schultz, L.; Mueller, K.H. [eds.], 604 pages.
Subject:
36 MATERIALS SCIENCE; NEODYMIUM ALLOYS; IRON ALLOYS; BORON ALLOYS; CASTING; GRAIN SIZE; PERMANENT MAGNETS; FERROMAGNETIC MATERIALS; DEMAGNETIZATION
OSTI ID:
20053318
Research Organizations:
Werkstoff-Informationsgesellschaft mbH, Frankfurt am Main (Germany)
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ISBN 3-88355-264-X; TRN: DE00G5157
Availability:
Available from TIB Hannover
Submitting Site:
DE
Size:
page(s) 77-86
Announcement Date:
Jan 15, 2004

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Citation Formats

Hirose, Y, Hasegawa, H, and Sasaki, S. Microstructure of strip cast alloys for high performance NdFeB magnets. Germany: N. p., 1998. Web.
Hirose, Y, Hasegawa, H, & Sasaki, S. Microstructure of strip cast alloys for high performance NdFeB magnets. Germany.
Hirose, Y, Hasegawa, H, and Sasaki, S. 1998. "Microstructure of strip cast alloys for high performance NdFeB magnets." Germany.
@misc{etde_20053318,
title = {Microstructure of strip cast alloys for high performance NdFeB magnets}
 author = {Hirose, Y, Hasegawa, H, and Sasaki, S}
 abstractNote = {Applications of strip cast (SC) alloys for production of high performance Nd-Fe-B sintered magnets are increasing rapidly. Because of the fast cooling rate during the codification, the formation of detrimental {alpha}-Fe dendrites and of large pools of Nd rich phase are suppressed, hence improving the magnetic properties of the magnets. We have investigated the influence of the composition on the microstructure of the SC alloys and found: (1) the formation of {alpha}-Fe can be suppressed if the alloy contains Nd more than 28.5 wt % in Nd-Fe-B ternary alloys, (2) no {alpha}-Fe formation occurs in the SC alloys with 10 wt % or more substitution of Nd by Dy even for the 2-14-1 stoichiometric alloys, (3) the Dy substitution increases the tendency for 2-17 phase formation. (orig.)}
 place = {Germany}
 year = {1998}
 month = {Jul}
 }