Magnetic properties and microstructural characterization of isotropic nanocrystalline Fe-Nd-B based alloys

Conference · Mon Nov 01 00:00:00 EST 1993 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)

OSTI ID:6824000

Manaf, A; Zhang, P Z; Ahmad, I; Davies, H A; Buckley, R A ^[1]

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1. Univ. of Sheffield (United Kingdom). Dept. of Engineering Materials

The effects of a nanocrystalline structure on the magnetic properties of isotropic melt spun Fe-Nd-B alloy ribbon are discussed. Three classes of alloys are considered: (a) low Nd (8--10 at.%) which also contain [alpha]-Fe; (b) near-stoichiometric Nd contents (11--13 at.%) which are single phase Fe[sub 14]Nd[sub 2]B; (c) high Nd (16--20 at%) which also contain a Nd-rich phase. For types (a) and (b), as the scale of the nanostructure decreases, the remanence J[sub r] is increasingly above J[sub s]/2 while the coercivity H[sub cj] is decreased, with a linear J[sub r]-H[sub cj] relationship. No J[sub r] enhancement occurs for type (c) alloys, even for a nanocrystalline structure, but rather a decrease due to volume dilution of the Fe[sub 14]Nd[sub 2]B phase. These effects are discussed in terms of inter-grain exchange coupling and de-coupling and the implications with respect to permanent magnets with improved properties are considered. In particular, it is demonstrated that the benefits of enhanced J[sub r] in terms of improved energy product are limited by corresponding attenuation of the coercivity.

• OSTI ID: 6824000
• Report Number(s): CONF-930416-; CODEN: IEMGAQ
• Journal Information: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States), Vol. 29:6Pt1; Conference: INTERMAG '93: international magnetics conference, Stockholm (Sweden), 13-16 Apr 1993; ISSN 0018-9464
• Country of Publication: United States
• Language: English

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