Enhanced magnetic and mechanical properties of die-upset Nd-Fe-B magnets prepared by spark plasma sintering via alloy powder blends

Magnetic and mechanical properties of die-upset Nd-Fe-B magnets prepared by spark plasma sintering via alloy powder blends have been investigated. The results showed that the MQP-C powder addition could improve the remanence and maximum energy product of die-upset Nd-Fe-B magnets. The maximum fracture toughness of die-upset Nd-Fe-B magnets was obtained at the MQP-C powder content ratio of 0.4, which indicates the proper MQP-C powder addition contributed to improve the mechanical properties of die-upset Nd-Fe-B magnets. Meanwhile, the MQP-C powder addition could improve the microstructure and crystallographic alignment of die-upset Nd-Fe-B magnets, and we presumed that the intrinsic coercivity of die-upset Nd-Fe-B magnets was mainly determined by the anisotropy field of Nd-Fe-B magnets, and the influence of microstructure defects on the mechanical properties was more sensitive than the magnetic properties of die-upset Nd-Fe-B magnets.