Abstract
The magnetic characteristics of some anisotropic Mischmetal (MM)-FeB and MM-FeB-Al permanent magnets have been investigated. The magnets were fabricated by hot pressing and die upsetting. The results for the hot-pressed MM-FeB magnets were H c = 2.42 × 10 5A/m, B r = 0.46 T and ( BH) max = 23 kJ/m 3 compared with H c = 1.39 × 10 5A/m, B r = 0.55 T and ( BH) max = 32.8 kJ/m 3 for die-upset magnets. On the other hand, hot-pressed MM-FeB-Al magnets gave H c = 2.41 × 10 5A/m, B r = 0.44 T and ( BH) max = 22.5 kJ/m 3 compared with H c = 1.85 × 10 5A/m, B r = 0.57 T and ( BH) max = 38.5 kJ/m 3 for die-upset magnets. X-ray diffraction and transmission electron microscope examinations revealed that the better magnetic properties in the die-upset magnets results from alignment of the c-axis along the die-upsetting direction. The magnetic anisotropy in die-upset magnets and the densification of the hot-pressed magnets are increased by Al substitution for Fe.
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