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Origins of Radial and Axial Inhomogeneity of Magnetic Performance in Cylindrical Nd-Fe-B Magnet Prepared by Hot Deformation

Cylindrical Nd-Fe-B magnets with different height reductions were prepared by hot deformation method. The inhomogeneity of the magnetic performance along the radial direction was revealed with a closed circuit B-H apparatus while that along the axial direction was shown with a vibrating sample magnetometer. The microstructure examined with scanning electron microscopy suggests that orientation variation and grain coarsening of Nd2Fe14B platelets cooperate to result in the deterioration of remanence along radial direction from center to edge. X-ray diffractometry was carried out over the end surfaces and axially across the middle cross-section of the cylindrical magnet, showing the important role of texture in determination of remanence along the axial direction. Further investigations on an intermediate hot-deformed magnets reveal the unevenness of deformation degree in the axial direction during hot deformation, which accounts for the axial variation of texture and consequent remanence.