Abstract
The Fe69.5–xNd7B21Nb2.5Gax (x = 0–1) permanent magnets in the form of rods were prepared by annealing the bulk amorphous alloys. The magnetic properties, phase evolution and microstructure of the alloys were investigated systematically. It is found that the glass forming ability (GFA), microstructure and magnetic properties are sensitive to Ga content for Fe69.5–xNd7B21Nb2.5Gax (x = 0–1) bulk alloys. The annealed alloys are mainly composed of soft α-Fe, hard Nd2Fe14B and nonmagnetic Nd1.1Fe4B4 phases. When x = 0.3, the optimally annealed magnets exhibit magnetic properties of the remanence Br = 0.63 T, intrinsic coercivity Hcj = 368.68 kA/m and maximum energy product (BH)max = 33.73 kJ/m3. Furthermore, magnetic field heat treatment at the temperature close to Curie temperature of Nd2Fe14B phase was applied to the annealed Fe69.2Nd7B21Nb2.5Ga0.3 magnet. The results of X-ray diffraction (XRD) and transmission electron microscopy (TEM) indicate that the magnetic field heat treatment can be beneficial for the precipitation of α-Fe. Thus, the Br, Hcj and (BH)max are enhanced by 8.7%, 6.3% and 16.3%, respectively.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
