Anisotropy and magnetic properties of Nd{sub 16}Fe{sub 76}B{sub 8} and Nd{sub 16}Fe{sub 75.9}B{sub 8}Zr{sub 0.1} HDDR materials

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · IEEE Transactions on Magnetics

OSTI ID:400771

Kwon, H W ^[1]

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1. National Fisheries Univ. of Pusan (Korea, Republic of). Dept. of Materials Science and Engineering

The alloys with chemical compositions of Nd{sub 16}Fe{sub 76{minus}x}B{sub 8}Zr{sub x} (x = 0, 0.1) have been HDDR processed, and the magnetic properties and anisotropy of the HDDR material have been characterized by means of VSM measurements using a magnetically aligned sample. Anisotropy of the HDDR powder material has been evaluated by comparing the remanence values of the aligned sample measured along the aligning direction and the direction perpendicular to it. It has been found that the intrinsic coercivity of the HDDR powder strongly depends on the particle size of the powder. As the particle size decreases, the intrinsic coercivity decreases radically, and this is explained in terms of structural damage induced in the particle during mechanical milling. It has also been found that the degree of alignment representing the anisotropy of the HDDR powder is enhanced with decreasing particle size. Some degree of alignment has also been observed in the HDDR material obtained from the Zr-free Nd-Fe-B-type alloy, and this may possible be attributed to either incomplete disproportionation, excess grain growth of the recombined grains or the presence of very fine particles as a result of milling.

• OSTI ID: 400771
• Report Number(s): CONF-960425--
• Journal Information: IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 5Pt2 Vol. 32; ISSN IEMGAQ; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
BORON ALLOYS
EXPERIMENTAL DATA
IRON BASE ALLOYS
MAGNETIC PROPERTIES
METALLURGICAL EFFECTS
NEODYMIUM ALLOYS
ZIRCONIUM
ZIRCONIUM ADDITIONS