Magnetic properties and microstructures of mischmetal-FeB-(Al, Ti and Al-Co) permanent magnets |
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| Authors: | K Y Ko S Yoon J G Booth H J Al-kanani S K Cho |
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| Affiliation: | (1) Joule Laboratory, Department of Physics, Salford University, Salford, M5 4WT, UK;(2) Department of Materials Science and Engineering, Ulsan University, Ulsan City, 680-749, South Korea |
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| Abstract: | 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 H
C = 5.1 kOe, B
r = 5.4 kG with (BH)max = 5.1 MGOe for hot-pressed MM-FeB-Al-Co magnets and H
C = 3.6 kOe, B
r = 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. |
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