PREFERRED CRYSTALLINE ORIENTATION OF MELT-SPUN ND-FE-M-B FLAKES (M=TI/ZR/HF/V/NB/TA)

Preferred crystalline orientation of Melt-spun Nd13Fe80-xMxB6 flakes (M= 0.5 to 3 at% of Ti, Zr, Hf, V, Nb or Ta) prepared by single roller melt spinning were studied by x-ray diffractometry, microstructure and magnetic measurements. Certain alloying elements, M= Ti, Zr, V and Ta, enhance both preferred crystalline orientation and coercivity at moderate wheel speeds, V(s), typically 8 to 15m/s. The degree of preferred orientation calculated from x-ray diffraction patterns is higher than 50% across the whole thickness, at V(s)= 8 and 10 m/s, despite the apparent equiaxed grains. Magnetic measurements on spun flakes and field aligned pulverized powders show highly anisotropic behavior. They have potential applications for anisotropic resin bond magnets.