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The application of expansion constraint during the grain-boundary diffusion process using Nd 70 Cu 30 eutectic alloy minimizes the remanence loss for the coercivity enhancement by optimizing the volume fraction of the Nd(Cu)-rich non-ferromagnetic intergranular layer. The diffusion-processed sample exhibits  0 H c ~ 2 T, µ 0 M r = 1.36 T and (BH) max = 358 kJ/m 3 at room temperature. Because of the low temperature coefficient of coercivity, the magnet showed (BH) max ~ 191 kJ/m 3 at 200C, which is superior to that of Dy-containing high-coercivity sintered magnets.

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High performance anisotropic NdFeB magnets prepared by dual-alloy die-upsetting J. Appl. Phys. 111, 07B540 (2012); 10.1063/1.3679866Effect of pressure loading rate on the crystallographic texture of NdFeB nanocrystalline magnets