Development of Nanocrystalline Multi-Component (Ce,La,Y)-Fe-B Alloys Without Critical Rare Earth Elements for Cost-Effective Permanent Magnets

Here we report the fully abundant rare earth-based nanocrystalline multi-component (Ce,La,Y)17Fe,sub>78B6 alloys containing no critical Nd/Pr/Dy/Tb with good combinations of room-temperature magnetic properties and thermal stability. The roles of La and Y substitutions for Ce have been fully understood. The enhanced coercivity Hcj by partial substitution of La is attributed to the increases of anisotropy field HA and the formation of continuously distributed grain boundaries resulting from the suppression of CeFe2 phase. Although Y substitution is not benefit for Hcj, the thermal stability has been effectively improved since Y2Fe14B shows weak temperature dependence of HA.