Sintered Nd-Fe-B Permanent Magnets: Microstructure, Diffusion and Coercivity
This community focuses on the metallurgy and microstructural engineering of rare-earth permanent magnets, specifically optimizing the grain boundary diffusion processes and thermal stability of sintered neodymium-iron-boron (Nd-Fe-B) alloys to enhance magnetic performance.
The work centers on manipulating the microstructure of sintered Nd-Fe-B magnets to improve coercivity and thermal stability. Key methods include grain boundary diffusion of heavy rare earths like dysprosium and terbium, as well as the substitution of critical elements with lighter rare earths such as cerium and lanthanum. Researchers investigate the role of grain boundaries in pinning magnetic domains, the effects of annealing and hot deformation, and the development of corrosion-resistant coatings. Emerging techniques include additive manufacturing of magnetic materials and the use of machine learning to optimize alloy compositions and processing parameters for high-temperature applications.
The largest share of the community's output is found in neodymium research, accounting for 5.6% of all neodymium studies, with 1,298 papers here; iron contributes the highest number of papers within this group, with 2,096 entries.
The community comprises 35,895 papers, primarily published in Physical Review B, Journal of Applied Physics, and Journal of Magnetism and Magnetic Materials.
Recent work continues to focus on reducing heavy rare-earth content through microstructure engineering and grain boundary diffusion, with specific studies on high-cerium Nd-Ce-Fe-B magnets, Sm-Fe-N magnets, and the use of recycled powder in additive manufacturing processes.