Microstructure and Magnetic Properties of (Nd1-2xPrxYx)2.28Fe13.58B1.14 Melt-Spun Alloys

As a rapid solidification technology, strip casting (SC) technology is one of importance method in the production of Nd2Fe14B-based rare-earth permanent magnets. (Nd1-2xPrxYx)2.28Fe13.58B1.14 (x=0.05, 0.10, 0.15, 0.20) alloys prepared by arc melting method under an argon atmosphere were annealed at 1173 K for 360 hrs and then were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Differential Scanning Calorimetry (DSC). Magnetic properties of the ribbons prepared by melt-spinning method with high cooling rate were measured by Physical Property Measurement System (PPMS). The XRD and SEM results showed that the annealed (Nd1-2xPrxYx)2.28Fe13.58B1.14 (x=0.10, 0.15, 0.20) alloys had a single phase with tetragonal Nd2Fe14B-tpyed structure, while the annealed (Nd0.90Pr0.05Y0.05)2.28Fe13.58B1.14 alloy contained Nd2Fe14B phase and α-Fe secondary phase. On the other hand, the coercivities (Hcj) of (Nd1-2xPrxYx)2.28Fe13.58B1.14 (x=0.05, 0.10, 0.15, 0.20) melt-spun alloys were about 13.42 kOe, 13.49 kOe, 7.97 kOe and 8.36 kOe, respectively, while the remanences (Br) of the alloys were 7.52 kGs, 7.48 kGs, 9.14 kGs and 7.48 kGs, respectively. In addition, The Curie temperature (Tc) of the annealed (Nd1-2xPrxYx)2.28Fe13.58B1.14 (x=0.05, 0.10, 0.15, 0.20) alloys were determined to be 573 K, 574 K, 579 K and 580 K, respectively.