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The microstructure evolution in hot-pressed and die-upset magnets was studied to clarify the impact of Nd–Cu diffusion on microstructure and coercivity. It was found that Nd–Cu diffusion mainly occurs at the interface of the raw powders during the hot-pressing process. In the die-upsetting process, grain boundary diffusion is main reason for the homogeneous distribution of Nd–Cu. Moreover, Nd–Cu grain...
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