Effect of high-abundance rare earth alloy addition on the microstructure and magnetic properties of nanocrystalline Nd-Fe-B magnets
Nanocrystalline Nd-Fe-B magnets exhibit excellent magnetic properties due to their fine grain size.First-ly,Nd-Fe-B magnetic powder is mixed with high abundance rare earth alloy powder,and then diffuses through heat treatment.It is found that PrLaCu alloy powder can significantly improve the coercivity of magnetic powder.Using the diffusion magnetic powder as the precursor,nanocrystalline Nd-Fe-B magnets are prepared by spark plasma sin-tering(SPS)technique.Microstructural characterization reveals that the magnet exhibits an overall alternating dis-tribution of coarse and fine grain regions.By regulating the La/Ce content in high-abundance rare-earth alloy pow-ders,the grain size and width of coarse and fine grain regions can be effectively modified,thereby enabling the fabri-cation of high coercivity nanocrystalline Nd-Fe-B magnets.The coercivity is enhanced by up to 36.2％compared to the reference magnet.The results demonstrate that this method is an effective strategy for enhancing magnetic prop-erties of nanocrystalline Nd-Fe-B magnets,offering substantial practical application value.
nanocrystalline Nd-Fe-B magnetmixed rare earth alloydiffusioncoarse grain regionfine grain region
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