Influence of LRE (Ce, Y, and La) on microstructure and magnetic properties of (Nd0. 8LRE0. 2)–Fe–B hot-deformed magnets

摘要: To develop low-cost, high-performance light rare earth element (LRE)-substituted Nd–Fe–B permanent magnets, we systematically studied the effect of substituting Nd with 20% light rare earth elements (LRE= Ce, Y, and La) on the hard magnetic properties of (Nd 0.8 LRE 0.2)–Fe–B hot-deformed magnets. The (Nd 0.8 Ce 0.2) 2 Fe 14 B magnet showed a coercivity of μ 0 H c= 1.41 T, which is comparable to that of an LRE-free magnet. Y substitution was found to decrease μ 0 H c and μ 0 M r to 1.22 and 1.32 T, respectively, as was expected from the intrinsic properties of (Nd 0.8 Y 0.2) 2 Fe 14 B. Unlike our expectation, the thermal stability of coercivity is not degraded by the Y substitution, demonstrating its potential for elevated temperature applications. With La substitution, coercivity is substantially degraded to 0.67 T because of the low intrinsic properties and the lack of the intergranular phase. The Y and Ce co …