Abstract
Several ways for improving the coercivity of the hot-deformed NdFeB magnets, mainly made from commercial MQU-F powders, were explored. First, mixing another commercial Dy-containing MQU-G powders into MQU-F powders could enhance the coercivity of the hot-deformed magnets from 15.1 to 22.1 kOe. The increment of magnetocrystalline anisotropy field for R2Fe14B with Dy substitution leads to coercivity enhancement. In addition, doping 2 wt% R70Cu30 alloy powders [R = Dy, Dy + Nd, mischmetal (MM)] into the hot-deformed NdFeB magnets is also effective in enhancing the coercivity to 19–19.5 kOe, originated from different mechanisms. Dy70Cu30-doped magnets and (Nd0.5Dy0.5)70Cu30-doped magnets show an almost identical enhancement of coercivity of about 4.4 kOe. Importantly, the latter magnet shows a beneficial effect of reducing the usage of Dy from 1.6 to 0.8 wt%. Most interestingly, Dy-free MM70Cu30-doped magnet (MM = Pr71Nd27Ce2) can also exhibit a comparable coercivity increment of about 4 kOe and yet still persist high magnetic energy product. The microstructure analysis shows that the entrance of Pr into 2:14:1 phase, grain refinement, modified grain shape, and Ce-containing grain boundary layer play crucial roles in its coercivity enhancement.
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