Anisotropic Hot-Deformed MRE-Fe-B Magnets With Zn Powder Addition $({\rm MRE}={\rm Nd}+{\rm Y}+{\rm Dy})$

Anisotropic magnets were fabricated by a vacuum hot deformation (VHD) method from isotropic MRE₂(Fe,Co)₁₄B ribbons mixed with Zn powder (MRE = Nd + Y + Dy). TEM microstructure shows that the VHD processing results in the formation of aligned platelet-like grains perpendicular to the pressing direction, and thus produces a strong magnetic anisotropy texture parallel to the pressing direction. The addition of Zn is helpful to develop higher magnetic anisotropy and retain better magnetic properties during the VHD processing. An optimized VHD magnet obtained a (BH)_max of 23.3 MGOe compared to 9.6 MGOe for the isotropic ribbons. The temperature coefficients of M_r and H_c for the VHD sample are -0.09 and -0.48%/°C in the temperature range of 27-127°C, respectively.