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To optimize the volume fraction of Nd-rich phase and c-axis alignment of Nd2Fe14B grains, a secondary deformation (SD, 20–50% thickness reduction) has been applied to the hot-deformed Nd-Fe-B magnets after Nd70Cu30 eutectic diffusion process. Although the SD50 sample showed the highest maximum energy product ((BH)max) of 411 kJ/m3 at 298 K, its (BH)max was strongly limited by its low coercivity of...
The effect of post-sinter tempering on the DyF 3 -diffusion processed Nd–Fe–B was investigated using two kinds of starting magnets. The increase of coercivity after diffusion process using as-sintered magnet was higher than that using two-stage tempered magnet. The grain boundary phase of the tempered magnet became discontinuous upon further annealing at the temperature of diffusion process...
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