New nanocrystalline high-remanence Nd-Fe-B alloys by rapid solidification

Azwar Manaf, R. A. Buckley, H. A. Davies

Research output: Contribution to journalArticlepeer-review

479 Citations (Scopus)

Abstract

A new type of permanent magnet alloy based on Nd-Fe-B, containing 8-9 at% Nd and processed by melt spinning, is described. Remanences of greater than 1 T are obtained in isotropic ribbon samples, with energy products, (BH)max in excess of 160 kJ m-3 and intrinsic coercivity up to about 485 kA m-1. Microstructurally, the alloys consist of two phase, a matrix of magnetically hard Nd2Fe14B with numerous particles of α-iron on grain boundaries. Both the mean grain size of the Nd2Fe14B ( < 30 nm) and the mean particle size of the α-iron ( < 10 nm) are ultra fine. The second quadrant of the J-H loop is typical of a single-phase, magnetically hard material. The relationship between magnetic properties and microstructure in these nanocrystalline two-phase alloys is discussed.

Original languageEnglish
Pages (from-to)302-306
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume128
Issue number3
DOIs
Publication statusPublished - 1 Jan 1993

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