Abstract
Laser powder bed fusion is a well-established additive manufacturing method that can be used for the production of net-shaped NdFeB magnets. However, low coercivity has been one of the drawbacks in the laser powder bed fusion processed NdFeB magnets. In this work, we have demonstrated that the grain boundary diffusion process using low-melting NdCu, NdAlNiCu, and NdTbCu alloys to the selective laser sintered NdFeB magnets can results in a substantial enhancement of coercivity from 0.65 T to 1.5 T. Detailed microstructure investigations clarified that the formation of Nd-rich grain boundary phase, the introduction of Tb-rich shell at the surface of Nd2Fe14B grains, and maintaining the grain size in nano-scale are responsible for the large coercivity enhancement.
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