Magnetic properties and microstructures of mischmetal-FeB-(Al, Ti and Al-Co) permanent magnets

The magnetic characteristics of anisotropic MM-FeB- (Al, Ti and Al-Co) permanent magnets have been investigated by using hot-pressing and die-upsetting process. The best magnetic properties obtained in these studies were HC = 5.1 kOe, Br = 5.4 kG with (BH)max = 5.1 MGOe for hot-pressed MM-FeB-Al-Co...

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Bibliographic Details
Published in:Journal of materials science 2002-04, Vol.37 (7), p.1421-1427
Main Authors: KO, K. Y, YOON, S, BOOTH, J. G, AL-KANANI, H. J, CHO, S. K
Format: Article
Language:English
Subjects:
Aluminum
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Demagnetization
Densification
Exact sciences and technology
Iron
Magnetic anisotropy
Magnetic properties
Magnetic properties and materials
Magnetism
Materials science
Mischmetal
Permanent magnets
Physics
Studies of specific magnetic materials
Titanium
Upsetting
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Summary:The magnetic characteristics of anisotropic MM-FeB- (Al, Ti and Al-Co) permanent magnets have been investigated by using hot-pressing and die-upsetting process. The best magnetic properties obtained in these studies were HC = 5.1 kOe, Br = 5.4 kG with (BH)max = 5.1 MGOe for hot-pressed MM-FeB-Al-Co magnets and HC = 3.6 kOe, Br = 6.7 kG, (BH)max = 6.8 MGOe for die-upset MM-FeB-Al-Co magnets. Higher squareness of demagnetization curve was obtained in anisotropic die-upset MM-FeB- (Al, Al-Co) magnets. X-ray diffraction and STEM investigations revealed that the higher magnetic properties in die-upset magnets were resulted from alignment of the c-axis along the die-upsetting direction. The magnetic anisotropy of the die-upset magnets and the densification of the hot-pressed magnets were increased by partial substitution of Al and Al-Co for Fe.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1014593217529