Abstract
Grain boundary diffusion process (GBDP) was first proposed for sintered Nd-Fe-B magnets to achieve the high utilization efficiency of heavy rare earth elements. Recent success of fabricating high performance nanocomposite magnets by GBDP indicates that this method also exerts huge applicable potential on hot-deformed Nd-Fe-B magnets. In this review, the development and magnetic property enhancement mechanisms of different diffusion methods proposed on hot-deformed magnets has been thoroughly elucidated. Moreover, the improve room for further property enhancement and the accompanying problems of GBDP on hot-deformed magnets are also discussed in this article. This review summarized the recent developments and progresses of grain boundary diffusion process on hot-deformed Nd-Fe-B permanent magnets. The magnetic property enhancement mechanisms and accompanied problems of different diffusion methods have been discussed in detailed in this work.
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