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首页> 外文期刊>Russian Metallurgy(Metally) >Structure and Mechanical Properties in the Submicrovolumes of Sintered KS25 (Co-Sm) Permanent Magnets
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Structure and Mechanical Properties in the Submicrovolumes of Sintered KS25 (Co-Sm) Permanent Magnets

机译：烧结KS25（CO-SM）永磁体亚微米（CO-SM）永磁体中的结构和机械性能

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摘要

The microstructure and the mechanical properties of the submicrovolumes in the rare-earth magnets KS25 sintered from a Co-25% Sm alloy is studied. The microstructure is studied by optical, electron, and atomic force microscopy. The microstructure is found to be characterized by the presence of SmCo5 dendrites, the interdendritic space consisting of a mixture of the SmCo5 and Sm2Co17 phases, individual Sm2Co17-phase grains, Zr5Co3FeSm compound crystals (1-5 mu m in size), and globular Sm2O3 samarium oxide inclusions (2-10 mu m in size). The hardness H (GPa) and Young's modulus E (GPa) of the main Sm2Co17 and SmCo5 phases are determined by nanoindentation. The machinability of the magnets is estimated using the nanoindentation data; the additional pressure and adhesion at the boundary of the Sm2Co17 and SmCo5 phases are calculated. The calculation shows that the additional pressure exceeds the external pressure by a factor of 300, and the adhesion of the phases (K-int = 0.543 MPa m(0.5)) is lower than that of the strengthening coatings by an order of magnitude. This finding can be the cause of magnet cracking along the boundary between the Sm2Co17 and SmCo5 phases during cutting and grinding.
机译：研究了来自CO-25％SM合金烧结的稀土磁体Ks25中亚麻筋的微观结构和机械性能。通过光学，电子和原子力显微镜研究微观结构。发现微观结构的特征在于Smco5树突，由SMCO5和SM2CO17相的混合物，单独的SM2CO17相晶粒，Zr5CO 3Fesm复合晶体（1-5μm大小）和球状Sm2O3组成的间霉菌间或钐含序（尺寸为2-10μm）。主SM2CO17和SMCO5相的硬度H（GPA）和杨氏模量E（GPA）通过纳米凸缘测定。使用纳米凸缘数据估计磁体的可加工性;计算SM2CO17和SMCO5相边界处的额外压力和粘附。该计算表明，额外的压力超过外部压力超过300，并且相比（K-int = 0.543MPa m（0.5））的粘附性低于强化涂层的倍数。该发现可以是沿着切割和研磨期间SM2CO17和SMCO5相之间的边界的磁铁开裂的原因。

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