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Bulk Nanocrystalline Nd-Fe-B Magnets Solidified in Magnetic Field With Various Surface Area-to-Volume Ratios

Bulk Nanocrystalline Nd-Fe-B Magnets Solidified in Magnetic Field With Various Surface Area-to-Volume Ratios,10.1109/TMAG.2011.2145413,IEEE Transactio

Bulk Nanocrystalline Nd-Fe-B Magnets Solidified in Magnetic Field With Various Surface Area-to-Volume Ratios  
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The bulk nanocrystalline Nd-Fe-B magnets in forms of rod and slab with various surface area-to-volume ratios (defined as S/V) were prepared by injection casting into copper molds. The effects of the surface area-to-volume ratio and the application of magnetic field during the casting process on the magnetic properties and microstructure of Nd Fe Ti Zr Cr B C alloy have been studied. The results show that the samples that have larger S/V values exhibit higher H and BH . The intrinsic coercivity of bulk magnet is more sensitive to the cooling rate of alloy melt than the remanence. The slab-shaped sample cast with magnetic field has a stronger (00L) texture of Nd Fe B phase with the c-axis perpendicular to the slab plane than the slab-shaped sample cast without magnetic field. Applying a magnetic field during the casting process is helpful to refine the grain size, thus improving the magnetic properties. Index Terms—Copper mold casting, magnetic field, magnetic properties, permanent magnets.
Journal: IEEE Transactions on Magnetics - IEEE TRANS MAGN , vol. 47, no. 10, pp. 3263-3266, 2011
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