In this work, a small amount of AlO powders (≤0.3 wt%) were incorporated into the SmCo-type sintered magnets, obtaining both high mechanical and magnetic properties. It is found that 0.1 % weight percentage of AlO doping is enough to enhance the flexural strength by about 20 % (∼ 180 MPa for the case of the -axis parallel to height). Meanwhile, the () remains around 219 kJ/m, and is 2052 kA/m, which is over 95 % of that of the original magnets without doping. The promising improvement in flexural strength is mainly attributed to the grain size effective refinement caused by SmO particles including newly-formed ones from the reaction of the AlO powder and Sm in the matrix. Furthermore, the grain size of the magnets decreases significantly with increasing of AlO doping up to 0.3 wt%. Especially, the grain size of 0.3 wt% AlO doped magnets is refined by 37 %. However, the flexural strengths (for the -axis parallel to height and the -axis parallel to width cases) of the magnets decrease sequentially and are even lower than that of the original magnet. The microstructure investigations indicate that the decrease in flexural strength may closely be correlated to the larger cell size and the incomplete cell boundaries phase. The obtained results infer that the flexural strength is susceptible to not only grain size but also the cellular structure of the magnets.

中文翻译：

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通过 Al2O3 掺杂对微观结构进行改性，实现机械坚固的高磁性能 Sm2Co17 烧结磁体


在这项工作中，将少量的Al2O3粉末（≤0.3 wt%）掺入SmCo型烧结磁体中，获得了较高的机械性能和磁性能。研究发现，0.1%重量百分比的Al2O掺杂足以将弯曲强度提高约20%（对于-轴平行于高度的情况，约为180 MPa）。同时，()保持在219 kJ/m左右，为2052 kA/m，是未掺杂的原始磁体的95%以上。弯曲强度的有希望的改善主要归因于 SmO 颗粒引起的晶粒尺寸有效细化，包括 Al2O3 粉末与基体中的 Sm 反应产生的新形成的颗粒。此外，随着 Al2O 掺杂量增加至 0.3 wt%，磁体的晶粒尺寸显着减小。特别是，0.3 wt% Al2O 掺杂磁体的晶粒尺寸细化了 37%。然而，磁体的抗弯强度（对于平行于高度的-轴和平行于宽度的-轴情况）依次减小，甚至低于原始磁体的抗弯强度。微观结构研究表明，弯曲强度的降低可能与较大的细胞尺寸和不完整的细胞边界相密切相关。所得结果表明，弯曲强度不仅受晶粒尺寸影响，而且受磁体的细胞结构影响。