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

Autor:	Ko, K. Y., Yoon, S., Booth, J. G., Al-kanani, H. J., Cho, S. K.
Předmět:	MISCHMETAL MAGNETIC properties PERMANENT magnets MICROSTRUCTURE X-ray diffraction SCANNING transmission electron microscopy
Zdroj:	Journal of Materials Science; Apr2002, Vol. 37 Issue 7, p1421-1427, 7p
Abstrakt:	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. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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